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[" 5.A number "n" is said to be perfect ...

[" 5.A number "n" is said to be perfect if the sum of all "],[" its divisors (excluding "n" itself) is equal to "n." An "],[" example of perfect number is "],[[" (a) "6," (b) "9],[" (c) "15," (d) "21]]

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PERFECT NUMBERS If the sum of all the factors of a number is two xx the number then the number is called a perfect number.