Question

Choose the one which is different from the rest three.

Options

• 272

• 210

• 240

• 304

Answer 1

240
Explanation:
As, 272 = 2 + 7 + 2 = 11 (Prime)
210 = 2 + 1+ 0 = 3 (Prime)
240 = 2 + 4 + 0 = 6 (Not prime)
304 = 3 + 0 + 4 = 7 (Prime)
The sum of digits of all numbers except 240 is a prime number whereas sum of the digits of number 240 is a non-prime. Hence, it is different from all others.