Suppose a is an integer, If a mod 7 = 4 what is 5a mod 7?

2015-11-10 2:45 pm

In other words, if division of a by 7 gives a remainder of 4, what is the remainder when 5a is divided by 7?

回答 (1)

2015-11-10 5:17 pm

5x4=20=14+6
5a≡6 mod 7

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