Regarding b%n=a%n

#1

How this happen as the property is(a-b)%n=((a%n)-(b%n)+n)%n

#2

Hey @Hk199977 it possible that even tho a is greater than b, but a%n is smaller than b%n for example if a = 8, b = 4 and n = 7. a is greater than b but a%n i.e 1 is smaller than b%n i.e 4 which will make the term inside modulo negative. So to avoid that we add n which returns the correct solution.

#3

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