(A) 68
(B) 72
(C) 70
(D) 63
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(A) 68
(B) 72
(C) 70
(D) 63
Correct Answer: (B) 72
Explanation: The series is increasing by adding 25, 36, 49, 64, 81, which are the squares of 5, 6, 7, 8, 9 respectively.
So, 11 + 25 = 36, 36 + 36 = 72, 72 + 49 = 121, 121 + 64 = 185, 185 + 81 = 266.
Therefore, the missing number is 72.