Here goes: 4 X 2 X 3 X 1 = 24
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22
You had me until "product." The product of 4 digits can't be prime.
2
When using significant digits, the product has only the number of significant digits as the lowest number in the factors. "20" has two significant digits and "310" has three. Therefore, the product has to have two significant digits. 310 × 20 = 6200 6200 already has two significant digits.