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Amit Tapas Grade: 10
        

FIND THE NO OF PERFECT DIVISORS 9!

6 years ago

Answers : (1)

Adhiraj Gautam
16 Points
										

The prime factorisation of 9 => 3^2


The number of perfect divisors of 9 = (2 + 1) - 2 = 1


Here, the first 2 is the exponent of 3 (the only prime in the factorisation of 9. The perfect divisors exclude 1 and 9 itself, so I subtracted 2 from the total number of divisors.


Similarly, the number of perfect divisors of 28 => 2^2 * 7 => (2 + 1)(1 + 1) - 2 = 4

6 years ago
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