Question

find the wrong numbers 13, 15, 19, 23, 29, 31​

Answer 1

Question

Find the wrong numbers 13, 15, 19, 23, 29, 31 ?

Type

Tricky and good question

Key

15

Solution

All numbers are prime number, whereas only 15 is a composite number.

15 = 3 × 5 × 1

13 = 1 × 13

19 = 1 × 19

23 = 1 × 23

29 = 1 × 29

31 = 1 × 31