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Number Series Questions
121. What will come in place of the question mark (?) in the following number series?
16, 24, 60, 210, 945, ?
16, 24, 60, 210, 945, ?
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Correct Ans:5197.5
Explanation:
Pattern:
16*1.5 = 24
24*2.5 = 60
60*3.5 = 210
210*4.5 = 945
945*5.5 = 5197.5
16*1.5 = 24
24*2.5 = 60
60*3.5 = 210
210*4.5 = 945
945*5.5 = 5197.5
Workspace
122. Find the missing number.
224, 113, 121, 269, 1140, ?
224, 113, 121, 269, 1140, ?
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Correct Ans:9245
Explanation:
The pattern is,
224*0.5 + 13 = 113
113*1 + 23 = 121
121*2 + 33 = 269
269*4 +43 = 1140
1140*8 + 53 = 9245
224*0.5 + 13 = 113
113*1 + 23 = 121
121*2 + 33 = 269
269*4 +43 = 1140
1140*8 + 53 = 9245
Workspace
123. Find the missing number.
4, 6, 15, 49, 201, 1011, ?
4, 6, 15, 49, 201, 1011, ?
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Correct Ans:6073
Explanation:
The pattern is,
4*1 + 2 = 6
6*2 + 3 = 15
15*3 + 4 = 49
49*4 + 5 = 201
201*5 + 6 = 1011
1011*6 + 7 = 6073
4*1 + 2 = 6
6*2 + 3 = 15
15*3 + 4 = 49
49*4 + 5 = 201
201*5 + 6 = 1011
1011*6 + 7 = 6073
Workspace
124. Find the Missing number in the the below series:
6, 29, 181, 1457, 14581, ?
6, 29, 181, 1457, 14581, ?
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Correct Ans:174985
Explanation:
Pattern is:
6 × 4 + 5 = 29
29 × 6 + 7 = 181
181 × 8 + 9 = 1457
1457 × 10 + 11 = 14581
14581 × 12 + 13 = 174985
Hence, the missing term is 174985
6 × 4 + 5 = 29
29 × 6 + 7 = 181
181 × 8 + 9 = 1457
1457 × 10 + 11 = 14581
14581 × 12 + 13 = 174985
Hence, the missing term is 174985
Workspace
125. Find the Missing number in the the below series:
4, 17, 43, 95, ?, 407
4, 17, 43, 95, ?, 407
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Correct Ans:199
Explanation:
Pattern is:
4 + 13 = 17
17 + (13 * 2) = 17 + 26 = 43
43 + (26 * 2) = 43 + 52 = 95
95 + (52 * 2) = 95 + 104 = 199
199 + (104 * 2) = 199 + 208 = 407
Hence, the missing term is 199
4 + 13 = 17
17 + (13 * 2) = 17 + 26 = 43
43 + (26 * 2) = 43 + 52 = 95
95 + (52 * 2) = 95 + 104 = 199
199 + (104 * 2) = 199 + 208 = 407
Hence, the missing term is 199
Workspace
126. Find the missing number.
10, 15, 35, 82.5, ?, 562.5
10, 15, 35, 82.5, ?, 562.5
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Correct Ans:205
Explanation:
The pattern is:
10 * 0.5 + 10 = 15
15 * 1 + 20 = 35
35 * 1.5 + 30 = 82.5
82.5 * 2 + 40 = 205
205 * 2.5 + 50 = 562.5
10 * 0.5 + 10 = 15
15 * 1 + 20 = 35
35 * 1.5 + 30 = 82.5
82.5 * 2 + 40 = 205
205 * 2.5 + 50 = 562.5
Workspace
127. Find the missing number.
630, 157.5, 45, 15, 6, ?
630, 157.5, 45, 15, 6, ?
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Correct Ans:3
Explanation:
The pattern is:
630 ÷ 4 = 157.5
157.5 ÷ 3.5 = 45
45 ÷ 3 = 15
15 ÷ 2.5 = 6
6 ÷ 2 = 3
630 ÷ 4 = 157.5
157.5 ÷ 3.5 = 45
45 ÷ 3 = 15
15 ÷ 2.5 = 6
6 ÷ 2 = 3
Workspace
128. In the following series one number is wrong.
Find out the wrong number
10, 14, 78, 114, 624, 726
Find out the wrong number
10, 14, 78, 114, 624, 726
SHOW ANSWER
Correct Ans:624
Explanation:
The series is,
10 + 22 = 14
14 + 43 = 78
78 + 62 = 114
114 + 83 = 626
626 + 102 = 726
10 + 22 = 14
14 + 43 = 78
78 + 62 = 114
114 + 83 = 626
626 + 102 = 726
Workspace
129. In the following series one number is wrong.
Find out the wrong number
1, 3, 10, 36, 152, 760, 4632
Find out the wrong number
1, 3, 10, 36, 152, 760, 4632
SHOW ANSWER
Correct Ans:760
Explanation:
The series is,
1*1 + 2 = 3
3*2 + 4 = 10
10*3 + 6 = 36
36*4 + 8 = 152
152*5 + 10 = 770
770*6 + 12 = 4632
1*1 + 2 = 3
3*2 + 4 = 10
10*3 + 6 = 36
36*4 + 8 = 152
152*5 + 10 = 770
770*6 + 12 = 4632
Workspace
130. Find the missing number.
7, 13, ?, 35, 54
7, 13, ?, 35, 54
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Correct Ans:22
Explanation:
The series is,
7*2 - 12 = 13
13*2 - 22 = 22
22*2 - 32 = 35
35*2 - 42 = 54
7*2 - 12 = 13
13*2 - 22 = 22
22*2 - 32 = 35
35*2 - 42 = 54
Workspace
131. Find the missing number.
12, 12, 18, 36, 90, 270, ?
12, 12, 18, 36, 90, 270, ?
SHOW ANSWER
Correct Ans:945
Explanation:
The series is,
12*1 = 12
12*1.5 = 18
18*2 = 36
36*2.5 = 90
90*3 = 270
270*3.5 = 945
12*1 = 12
12*1.5 = 18
18*2 = 36
36*2.5 = 90
90*3 = 270
270*3.5 = 945
Workspace
132. Find the missing number.
6, 26, 134, 666, 3334, 16666, ?
6, 26, 134, 666, 3334, 16666, ?
SHOW ANSWER
Correct Ans:83334
Explanation:
The series is,
6*5 - 4 = 26
26*5 + 4 = 134
134*5 - 4 = 666
666*5 + 4 = 3334
3334*5 - 4 = 16666
16666*5 + 4 = 83334
6*5 - 4 = 26
26*5 + 4 = 134
134*5 - 4 = 666
666*5 + 4 = 3334
3334*5 - 4 = 16666
16666*5 + 4 = 83334
Workspace
133. In the following series one number is wrong.
Find out the wrong number
28, 14.5, 15.5, 24.75, 51.5, 133.25, 396.75
Find out the wrong number
28, 14.5, 15.5, 24.75, 51.5, 133.25, 396.75
SHOW ANSWER
Correct Ans:133.25
Explanation:
The series is
28*0.5 + 0.5 = 14.5
14.5*1 + 1 = 15.5
15.5*1.5 + 1.5 = 24.75
24.75*2 + 2 = 51.5
51.5*2.5 + 2.5 = 131.25
131.25*3 + 3 = 396.75
28*0.5 + 0.5 = 14.5
14.5*1 + 1 = 15.5
15.5*1.5 + 1.5 = 24.75
24.75*2 + 2 = 51.5
51.5*2.5 + 2.5 = 131.25
131.25*3 + 3 = 396.75
Workspace
134. In the following series one number is wrong.
Find out the wrong number
9, 10, 19, 58, 231, 1166, 6935
Find out the wrong number
9, 10, 19, 58, 231, 1166, 6935
SHOW ANSWER
Correct Ans:1166
Explanation:
The series is
9 × 1 + 1 = 10
10 × 2 – 1 = 19
19 × 3 + 1 = 58
58 × 4 – 1 = 231
231 × 5 + 1 = 1156
1156 × 6 – 1 = 6935
9 × 1 + 1 = 10
10 × 2 – 1 = 19
19 × 3 + 1 = 58
58 × 4 – 1 = 231
231 × 5 + 1 = 1156
1156 × 6 – 1 = 6935
Workspace
135. Find the missing number.
?, 212, 339, 508, 725, 996
?, 212, 339, 508, 725, 996
SHOW ANSWER
Correct Ans:121
Explanation:
The series is
121 = 53 - 4
212 = 63 - 4
339 = 73 - 4
508 = 83 - 4
725 = 93 - 4
996 = 103 - 4
121 = 53 - 4
212 = 63 - 4
339 = 73 - 4
508 = 83 - 4
725 = 93 - 4
996 = 103 - 4
Workspace
136. Find the missing number.
3, 4, 12, ?, 196, 1005
3, 4, 12, ?, 196, 1005
SHOW ANSWER
Correct Ans:45
Explanation:
The series is
3*1 + 1 = 4
4*2 + 4 = 12
12*3 + 9 = 45
45*4 + 16 = 196
196*5 + 25 = 1005
3*1 + 1 = 4
4*2 + 4 = 12
12*3 + 9 = 45
45*4 + 16 = 196
196*5 + 25 = 1005
Workspace
137. Find the missing number.
10395, 6930, 2772, 792, 176, ?
10395, 6930, 2772, 792, 176, ?
SHOW ANSWER
Correct Ans:32
Explanation:
The series is
10395 * 2/3 = 6930
6930 * 2/5 = 2772
2772 * 2/7 = 792
792 * 2/9 = 176
176 * 2/11 = 32
10395 * 2/3 = 6930
6930 * 2/5 = 2772
2772 * 2/7 = 792
792 * 2/9 = 176
176 * 2/11 = 32
Workspace
138. In the following series one number is wrong.
Find out the wrong number
1, 4, 6, 17, 29, 66, 125
Find out the wrong number
1, 4, 6, 17, 29, 66, 125
SHOW ANSWER
Correct Ans:125
Explanation:
The series is
4 - 1 = 3 = 21 + 1
6 - 4 = 2 = 22 - 2
17 - 6 = 11 = 23 + 3
29 - 17 = 12 = 24 - 4
66 - 29 = 37 = 25 + 5
(124) - 66 = 58 = 26 - 6
4 - 1 = 3 = 21 + 1
6 - 4 = 2 = 22 - 2
17 - 6 = 11 = 23 + 3
29 - 17 = 12 = 24 - 4
66 - 29 = 37 = 25 + 5
(124) - 66 = 58 = 26 - 6
Workspace
139. In the following series one number is wrong.
Find out the wrong number
14, 15.5, 32.5, 99, 397.5, 1990, 11935.5
Find out the wrong number
14, 15.5, 32.5, 99, 397.5, 1990, 11935.5
SHOW ANSWER
Correct Ans:1990
Explanation:
The series is
14 × 1 + 1.5 = 15.5
15.5 × 2 + 1.5 = 32.5
32.5 × 3 + 1.5 = 99
99 × 4 + 1.5 = 397.5
397.5 × 5 + 1.5 = 1989
1989 × 6 + 1.5 = 11935.5
14 × 1 + 1.5 = 15.5
15.5 × 2 + 1.5 = 32.5
32.5 × 3 + 1.5 = 99
99 × 4 + 1.5 = 397.5
397.5 × 5 + 1.5 = 1989
1989 × 6 + 1.5 = 11935.5
Workspace
140. Find the missing number.
6, 7, 16, 51, 208, ?, 6276
6, 7, 16, 51, 208, ?, 6276
SHOW ANSWER
Correct Ans:1045
Explanation:
The series is
6 * 1 + 1 = 7
7 * 2 + 2 = 16
16 * 3 + 3 = 51
51 * 4 + 4 = 208
208 * 5 + 5 = 1045
1045 * 6 + 6 = 6276
6 * 1 + 1 = 7
7 * 2 + 2 = 16
16 * 3 + 3 = 51
51 * 4 + 4 = 208
208 * 5 + 5 = 1045
1045 * 6 + 6 = 6276
Workspace
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