In this question four number-pairs have been given, out of which three are alike in a certain manner and one is different. Choose the odd number-pair out from the given alternatives.

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  1. 12 : 156
  2. 15 : 240
  3. 14 : 210
  4. 21 : 468

Answer (Detailed Solution Below)

Option 4 : 21 : 468
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Detailed Solution

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Logic : (1st number) × (1st number + 1) = Second number

Lets check each option:

1) 12 ∶ 156

⇒ 12 × (12 + 1) = 12 × 13 = 156

⇒ This pair follows the logic.

2) 15 ∶ 240

⇒ 15 × (15 + 1) = 15 × 16 = 240

⇒ This pair follows the logic.

3) 14 ∶ 210

⇒ 14 × (14 + 1) = 14 × 15 = 210

⇒ This pair follows the logic.

4) 21 ∶ 468

⇒ 21 × (21 + 1) = 21 × 22 = 462

⇒ This pair does not follow the logic.

21 : 468 is the odd one out.

Hence, 'option 4' is the correct answer.

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