Question

Find the wrong number in the series: 3, 5, 12, 38, 154, 914, 4634.

Answer 1

The wrong number is 914(correct, 772).

Step-by-step explanation:

The given sequence are:

3, 5, 12, 38, 154, 914, 4634.

The pattern follow,

$\times 1 +2,\times 2 +2,\times 3 +2,\times 4 +2,\times 5 +2,\times 6 +2,.... .$

$5=3\times 1+2=3+2=5$

$12=5\times 2+2=10+2=12$

$38=12\times 3+2=36+2=38$

$154=38\times 4+2=152+2=154$

$914=154\times 5+2=770+2=772\neq 914$, 914 is a wrong number.

$4634=772\times 6+2=4632+2=4634$

Hence, the wrong number is 914(correct, 772).