Q: Find the invalid no.from the following series 13, 18, 25, 30, 37, 40\nOptions:\n(A) 30\n(B) 35\n(C) 40\n(D) 47\n(E) 50 Let's give some random thoughts before answering.
User
The differences between two successive terms from the beginning are 7, 5, 7, 5, 7, 5. So, 40 is wrong.
Therefore, the answer is (C).
Assistant