What is the unit digit in (4137)754?

1.

What is the unit digit in (4137)⁷⁵⁴?

[A].	1
[B].	3
[C].	7
[D].	9

Answer: Option D

Explanation:

Unit digit in (4137)⁷⁵⁴ = Unit digit in {[(4137)⁴]¹⁸⁸ x (4137)²}

=Unit digit in { 292915317923361 x 17114769 }

= (1 x 9) = 9

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