Question

What is the unit's digits in the product 7³⁵×3⁷¹×11⁵⁵
A.1
B.3
C.7
D.9

Answer 1

A.1

Explanation:

Apply exponent rule
`(3^(7)) ^1(11^(5) *7^(3) )^(5)`

`=55240493^(5)(3^(7))^(1)`

Apply rule a^1=a =
`3^(7) *55240493^(5)`

`=55240493^(5)*2187`

= 1.2496......E42

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