What is the remainder when 15987 797 is divided by 10? Options: A . &nbsp3 B . &nbsp1 C . &nbsp7 D . &nbsp9

What is the remainder when 15987797 is divided by 10?

Question

What is the remainder when

15987^{797}

is divided by 10?

Options:

A . 3

B . 1

C . 7

D . 9

Answer: Option C
:
C
Express the power in the form of 4K + X. In this case 797 = 4K + 1.

15987^{1}

= Unit digit is 7. Hence, remainder is 7 when divided by 10.

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