Find the invalid no.from the following series 13, 18, 25, 30, 37, 40
Pick one: A) 23 B) 26 C) 40 D) 42 E) 49
The differences between two successive terms from the beginning are 7, 5, 7, 5, 7, 5. So, 40 is wrong.   40
<result>C</result>
Find the invalid no.from the following series 13, 18, 25, 30, 37, 40