**In how many ways can a number be written as a product of two different factors?**

Let Number=x

Let Its prime factors are:

2^{a}*3^{b}*5^{c}…………….and so on

Number of factors

=(a+1)(b+1)(c+1)………… and so on

Required number of ways

=[(a+1)(b+1)(c+1)………… and so on]/2

If Required number of ways result to a.b then Required number of ways=a+1

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