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11.	1, 4, 9, 16, 25, ?
	A. 24 B. 36 C. 41 D. 43

Ans: B.

Sol.
The numbers are 1², 2², 3³, 4², ....
So missing number = 6² = 36.

12.	10, 14, 26, 42, 70, ?
	A. 100 B. 102 C. 106 D. 114

Ans: D.

Sol.
Each term of the series, except the first two terms, is 2 more than the sum of the preceding two terms
So, missing term = (42 + 70 ) = 114.

13.	1, 9, 25, 49, 81, ?
	A. 103 B. 112 C. 121 D. 144

Ans: C.

Sol.
The series consists of squares of consecutive prime numbers i.e. 1², 3², 5², 7², 9²,.....
So, missing term = 11² = 121.

14.	2, 6, 12, 20, 30, 42, 56, ?
	A. 50 B. 60 C. 72 D. 78

Ans: C.

Sol.
The sequence is 1 × 2, 2 × 3, 3 × 4, 4 × 5, 6 × 7, 7 × 8.
So missing term = 8 × 9 = 72.

15.	1, 9, 25, 49, ?, 121
	A. 72 B. 76 C. 78 D. 81

Ans: D.

Sol.
The given series consists of squares of consecutive odd numbers. i.e. 1², 3², 5², 7², ....
So, missing term = 9² 81.

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