1.  7, 8, 18, 57, 228, 1165, 6996
A. 8
B. 18
C. 57
D. 228
E. 1165

Answer: Option D

Explanation:

Let the given numbers be A, B, C, D, E, F, G.

Then, A, A x 1 + 1, B x 2 + 2, C x 3 + 3, D x 4 + 4, E x 5 + 5, F x 6 + 6 are the required numbers.

Clearly, 228 is wrong.