Question 23

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

Solution

The pattern followed is:

(10 x 10) - 1 = 99

(9 x 9) + 1 = 82

(4 x 4) + 1 = 17

(5 x 5) + 1 = 26

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