Question 14

Three of the following four pairs of numbers are alike in a certain way and one is different. Find the odd one out.

Solution

Let us examine the pattern in difference between the stated numbers.

153-136 = 17 -> Prime number

171-152 = 19 -> Prime number

72-63 = 9 -> Non-prime number

117-104 = 13. -> Prime number

Hence, the pair 72-63 is the odd pair among the given 4 pair of numbers.

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