Number Series: Aptitude Questions with Answers – Free Practice!

Q. 1 Find the last term: 2, 4, 8, 16, 32, ?

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Ans: B

Multiplying by 2 each time: 2*2*2*2*2*2 = 64

Q. 2 Find the last term: 3, 6, 11, 18, 27, ?

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Ans: C

Differences are increasing by 2: +3,+5,+7,+9,+11

Q. 3 Find the last term: 121, 144, 169, 196, ?

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Ans: A

Series of perfect squares: $11^2,12^2,13^2,14^2,15^2 = 225$

Q. 4 Find the last term: 1, 4, 9, 16, 25, ?

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Ans: B

Series of perfect squares: $1^2,2^2,3^2,4^2,5^2 = 25$

Q. 5 Find the last term: 5, 10, 20, 40, ?

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Ans: C

Solution: Multiplying by 2: 5×2=10, 10×2=20

Q. 6 Find the last term: 2, 6, 12, 20, 30, ?

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Ans: A

Differences are +4,+6,+8,+10,+12

Q. 7 Find the last term: 1, 3, 7, 15, 31, ?

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Ans: A

Series is $2^n-1$
$2^1-1 = 1$
$2^2-1 = 3$
$2^3-1 = 7$
$2^4-1 = 15$
$2^5-1 = 31$
$2^6-1 = 63$

Q. 8 Find the last term: 13, 17, 19, 23, 29, ?

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Ans: B

Series of prime numbers.

Q. 9 Find the last term: 97, 89, 83, 79, 77, ?

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Ans: B

Subtracting successively: -8, -6, -4, -2, -4

Q. 10 Find the last term: 0, 1, 1, 2, 3, 5, 8, ?

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Ans: B

Fibonacci series

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