Series Completion Questions and Answers updated daily – Verbal Ability



20 Series Completion Questions and answers section with explanation for various online exam preparation, various interviews, Verbal Ability Series Completion online test. Series Completion Questions with detailed description, explanation will help you to master the topic.

Series Completion Questions

1. What number should come next in the series, 1, 2, 3, 5, 8, ?



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Correct Ans:13
Explanation:
In this series, each term is the sum of preceding two terms as,
1+2 = 3
3+2 = 5
5+3 = 8
Next term in the series will be,
8+5 = 13


2. 1,6,15,(...),45,66,91



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Correct Ans:28
Explanation:
Pattern in the series is, +5, +9, .., .., +21, +25
So 4 is getting increased at every term addition.
Missing term in the series will be 15+(9+4)
= 15+13 = 28


3. 21,25,33,49,81, ?



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Correct Ans:145
Explanation:
Pattern is, +4, +8, +16, +32, so next will be +64
81+64 = 145


4. 2,5,9,?,20,27, what will replace the question mark ?



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Correct Ans:14
Explanation:
Pattern is +3,+4,..,..,+7, so +5 and +6 will be in the blanks

Question mark will be replaced by 9+5 = 14


5. 1,9,17,33,49,73, ?



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Correct Ans:97
Explanation:
Pattern for the given series is, +8, +8, +16, +16, +24

So next will be +24, 73+24 = 97


6. 6, 12, 21, ?, 48



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Correct Ans:33
Explanation:
The pattern is + 6, + 9, + 12, + 15, .....

So, missing term = 21 + 12 = 33.


7. 2, 3, 5,7,11,?, 17



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Correct Ans:13
Explanation:
Clearly, the given series consists of prime numbers starting from 2. So, the missing

term is the prime number after 11, which is 13.


8. 198, 194, 185, 169, ?



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Correct Ans:144
Explanation:
The pattern is - 4, - 9, - 16,.....i.e. - 22, - 32, - 42,.....

So, missing pattern = 169 - 52 = 169 - 25 = 144.


9. 1, 3, 4, 8, 15, 27, ?



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Correct Ans:50
Explanation:
The sum of any three consecutive terms of the series gives the next term.

So, missing number = 8 + 15 + 27 = 50.


10. 5,6,9, 15, ?, 40



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Correct Ans:25
Explanation:
The pattern is + 1, + 3, + 6,....., i.e. + 1, + (1, + 2), + (1 + 2 + 3),.....

So, missing term = 15 + (1 + 2 + 3 + 4) = 25


11. 6, 13, 25, 51, 101, ?



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Correct Ans:203
Explanation:
The pattern is x 2 + 1, x 2 - 1, x 2 + 1, x 2 - 1,.....

So, missing term = 101 x 2 + 1 = 203.


12. 1, 2, 3, 6, 9, 18, ?, 54



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Correct Ans:27
Explanation:
The pattern is x 2, x 3/2, x 2, x 3/2, x 2,.....

So, missing term = 18 x 3/2 = 27.


13. 125,80,45,20,?



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Correct Ans:5
Explanation:
The pattern is - 45, - 35, - 25, .....

So, missing term = 20 - 15 = 5.


14. 589654237, 89654237, 8965423, 965423, ?



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Correct Ans:96542
Explanation:
The digits are removed one by one from the beginning and the end in order alternately

so as to obtain the subsequent terms of the series.


15. 120, 99, 80, 63, 48, ?



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Correct Ans:35
Explanation:
The pattern is - 21, - 19, - 17, - 15,.....

So, missing term = 48 - 13 = 35.


16.
6, 11, 21, 36, 56, ? 
what will replace the question mark in the series ?



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Correct Ans:81
Explanation:
Pattern is +5, +10, + 15, +20

Next number in the series will be 56 + 25 = 81


17.
Complete the series
20, 19, 17, ...., 10, 5



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Correct Ans:14
Explanation:
Pattern is, -1, -2, ..,.. , -5

So -3 and -4 will fill the blanks to make it a pattern.

Next number will be 17-3 = 14


18. Complete the series, 1, 4, 9, 16, 25,....



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Correct Ans:36
Explanation:
Series Pattern is +3, +5, +7, +9.

So next number = 25+11 = 36


19.
Which number would replace the question mark in series
7,12,19,?,39



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Correct Ans:28
Explanation:
Pattern is , +5, +7, +9
Missing Number = 19+9 = 28


20. Complete the series 2,2,5, 13,28,....



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Correct Ans:52
Explanation:
begin{aligned}
text{Pattern is }\
+1^2-1, +2^2-1, +3^2-1,+4^2-1 \
5^2-1 = 28 + 24 \
= 52
end{aligned}



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