1.

D 372) 403) 624) 41

Answer»

f(n) = n + (the product of the nonzero digits of n).

12 + (1 * 2) = 12 + 2 = 14,

14 + (1 * 4) = 14 + 4 = 18

18 + (1 * 8) = 18 + 8 = 26,

26 + (2 * 6) = 26 + 12 = 38,

38 + (3 * 8) = 38 + 24 = 62

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