Solution
$$3 \times 2 - 1 = 5$$
$$5 \times 3 -1 = 14$$
$$ 14 \times 4 - 1 = 55$$
$$ 55 \times 5 - 1 = 274$$
$$274 \times 5 - 1 = 1643$$
Hence, the missing number is 5
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