Why are we adding one to find the number of factors?
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Basically the idea behind the method is of the total no. of combinations possible for each power of all the prime no. in the prime factorisation of the no. Now this should also include zeroth power of each no. so 1 is added to each power to include 0 too as from 1 to n there are n no.'s but from 0 to n there are n+1 no.'s.
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