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The product of 3 and 7 is 21
7n + 21 or 7(n + 3)
No. 3x7=21. 21 can be divided by 3 and 7 of course. You can multiply anything and the product would always be composite (except 1 and 0). Hope this helped :)
Yes, the product of two whole numbers is a whole number. For example 3*7 = 21
3*21=63