Question 23

3, ?, 14, 55, 274, 1643

Solution

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$$3 \times 2 - 1 = 5$$

$$5 \times 3 -1 = 14$$

$$ 14 \times 4 - 1 = 55$$

$$ 55 \times 5 - 1 = 274$$

$$274 \times 5 - 1 = 1643$$

Hence, the missing number is 5

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