Banking Sample Paper SBI PO (Main) Sample Test Paper-8

Direction: In each of the following number series a wrong number is given. Find out the wrong number.

15         70         175       380       775       1590     3195

A) 175

B) 380

C) 1590

D) 775

E) 3195

Correct Answer: D

Solution :

The series is \[+55+(55\times 2-5),+(105\times 2-5),+(205\times 2-5),\]\[+(405\times 2-5),+(805\times 2-5),...\] There should be 785 in place of 775.