LCM and HCF Practice Test 4

Question : 20 of 40

Marks: +1, -0

A number n is said to be perfect, if the sum of all its divisors (excluding n itself) is equal to n. A perfect number is

Number (n)	Divisors excluding the number (n)	Sum of divisors
21	1, 3, 7	11
15	1, 3, 5	9
9	1, 3, 3	7
6	1, 2, 3	6

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