Question: Find the invalid no.from the following series 13, 18, 25, 30, 37, 40
Options:
(A) 13
(B) 18
(C) 40
(D) 30
(E) 37 Random thoughts:
The differences between two successive terms from the beginning are 7, 5, 7, 5, 7, 5. So, 40 is wrong. The final answer: (C).