Question

What is the unit’s place of (5^n + 4^2n + 7^4n)^4n?


(A) 4 (B) 8 (C) 2 (D) 6​

Answer 1

Answer:

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Answer 2

Answer:

answer is 6

unit of 5^n always 5

unit of 4^2n always 6

unit of 7^4n always 1

unit place of bracket is 5+6+1 =12

i. e. 2 leave carry cause it 10th place

and unit of 2^4n always 6

that's why answer is 6