Elitmus Exam Numerical Ability Number System

what is the number that should be subtracted from 682 to make it a perfect square?
a, 2
b, 4
c, 6
d, 8

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Elitmus Other Question

let total profit=x
for charity=x*(4/100)=x/25
The value of (1/512)^1/9 is.
a, 1/2
b, 1/3
c, 1/4
d, 1/6