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Middle digit is the product of first and last digit in all the number except 451.
5, 23, 18, 36, 31, ?
38% of 18/225 of 31/19 of 15225 =?
456, 460, 444, 508, 252, ?
22, 37, 63, 98, 148, ?
5, 18, 39, ?, 105, 150
1, 7, 25, 61, ?
12 18 31 51 ? 112
45, 166, 607, 1568, 3249, ?
9000, 1800, 450, ?, 75, 75
