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