NIELIT 2021 Dec Scientist B - Section A: 3

Question

Directions $(3-5) :$ In each of the following questions, one number is wrong in the series. Find out the wrong number.

$3, 5, 12, 39, 154, 772, 4634 :$

• A. $5$
• B. $3$
• C. $39$
• D. $154$

Answer 1

The given series having following pattern:

• $3*1+2=3$
• $5*2+2=12$
• $12*3+2=38 \rightarrow (39)$ is wrong term here.
• $38*4+2=154$
• $154*5+2=772$
• $772*6+2=4634$

$\therefore$ Option $(C)$ is correct here.