What is th unit digit in ( 365+659+771 ) ?

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What is th unit digit in ( 3⁶⁵+6⁵⁹+7⁷¹ ) ?

1. 6
2. 4
3. 2
4. 1

Correct Option: B

Unit digit in 3⁴ = 1
∴ Unit digit in ( 3⁴ )¹⁶ = 1
∴ Unit digit in 3⁶⁵ = 3
Unit digit in 6⁵⁹ = 6
Unit digit in 7⁷¹ = 3

∴ Required unit digit = Unit digit in ( 3 x 6 x 3 )
= Unit digit in 54
= 4