Maths Maths Puzzle Numerical Ability

given that a and b are two prime numbers,while n is a natural number,such that
1/a+1/b+1/ab=1/n. find the value of ||a-b|-n|.
a) 4 b) 0 c)2 d)1

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Maths Other Question

what is the definition of infinitive related to maths????? In hw many ways can 21 eng buks n 19 Hindi buks b placed so that two buks on Hindi may not b together?