Numbers

What is the unit digit in 7¹⁰⁵ ?

A 1

B 5

C 7

D 9

ANS:C - 7

Unit digit in 7¹⁰⁵ = Unit digit in [ (7⁴)²⁶ x 7 ] But, unit digit in (7⁴)²⁶ = 1 Unit digit in 7¹⁰⁵ = (1 x 7) = 7

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