Question

Out of the given options, three are similar in a certain manner. However, one option is NOT like the other three. Select the option which is different from the rest.
1. 209
2. 231
3. 247
4. 253

Answer 1

Correct Answer - Option 3 : 247

The logic follows here is:

Number	Category
209	Divisible by 11
231	Divisible by 11
247	Cannot be Divisible by 11
253	Divisible by 11

As, All the given numbers is easily divisible by 11 except 247. 247 is divisible by 13 and 19.

Hence, " 247" is the correct answer.

1.  A Prime Numbers is one that is divisible by 1 and itself. i.e. 2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53....etc.
2.  A number is divisible by 11 if the sum of the digits in the odd places and the sum of the digits in the even places difference is a multiple of 11 or zero.
3. Example: 209 → 2 + 0 + 9 = 11 that is divisible by 11.