if x^n-y^n is divisible by x-y then n is
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let value of n = 1
P(1)=x-y which is divisible by x - y
let P(k) be true
x^k-y^k is divisible by x - y
P(k+1) should be true if P(k) is true
x^(k+1)-y^(k+1) must be divided by x-y
P(1)=x-y which is divisible by x - y
let P(k) be true
x^k-y^k is divisible by x - y
P(k+1) should be true if P(k) is true
x^(k+1)-y^(k+1) must be divided by x-y
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