A digit is a numerical symbol (like "2" or "9" or even "0") that is used to write down a number that is either larger than 10 (or smaller than -10) or when writing down a decimal fraction like 0.2453). In your case there are three numerical symbols in the number 1, 4 and 7, so you can choose if you need just two.
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They are: 3*49 = 147
two
-147
42 147/7 = 21 21 x 2 = 42
22