n is a whole number which when divided by 7 gives 4 as remainder. What will be the remainder when 2n is divided by 7?

3

2

1

0

Let n = 7q + 4. Then 2n = 14q + 8 = 7(2q + 1 ) + 1. Thus, when 2n is divided by 7, the remainder is 1.

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