Find the invalid no.from the following series 13, 18, 25, 30, 37, 40\nOptions:\n(A) 23\n(B) 35\n(C) 40\n(D) 45\n(E) 67 Let's think first. Stream of consciousness:
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The differences between two successive terms from the beginning are 7, 5, 7, 5, 7, 5. So, 40 is wrong.
So, the answer is (C).
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