Question 9

Pick the odd pair out.

Solution

$$ 49 = 17\times 3 - 2 = 51 - 2 = 49 $$

$$13 = 5 \times 3 - 2 = 15 - 2 = 13$$

$$ 25 = 9\times 3 -2 = 27 - 2 = 25$$

$$41 \ne 15\times 3 - 2 = 45 - 2 = 43$$

Hence this option is our answer as it doesn't satisfy our condition.

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