Find the invalid no.from the following series 13, 18, 25, 30, 37, 40	Choose the correct choice from the following:
A) 21	B) 25	C) 40	D) 47	E) 58
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