Question

Choose the Wrong Number : 3, 13, 31, 58, 91, 111
3, 13, 31, 58, 91, 111 choose the wrong number in the series? A) 111 B) 58 c) 31 D) 91 Please help me to solve this problem?

Answer 1

 58 is the wrong number because it is only composite number in the series. So option B) is correct.

Answer 2

The wrong number is B) 58.

Step-by-step explanation:

The given sequence are:

3, 13, 31, 58, 91, 111

To find, the wrong number = ?

The pattern follow:

$x^{2} +(x+1).$

$3=1^{2} +(1+1)=1+2=3$

$13=3^{2} +(3+1)=9+4=13$

$31=5^{2} +(5+1)=25+6=31$

$58=7^{2} +(7+1)=49+8=57\neq 58$, is wrong number.

$91=9^{2} +(9+1)=81+10=91$

$111=10^{2} +(10+1)=100+11=111$

Hence, the wrong number is B) 58.