Combination of n Different Things Taken One or More at a Time
Let 1440=x· y...
Question
Let 1440=x⋅y, where x and y are coprime to each other, then the possible pairs (x,y) is
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Solution
1440=25⋅33⋅5
Here, total different prime factors are 3 ∴ number of ways in which 1440 can be resolved as product of two coprime numbers is 23−1=4
However, (x,y) can interchange their places. ∴ total possible pairs (x,y) is 8