# QA – Placement Quizzes | HCF | Question 4

A perfect number n is a number which is equal to the sum of its divisors. Which of the following is a perfect number?**(A)** 6**(B)** 9**(C)** 15**(D)** 21**Answer:** **(A)****Explanation:** 6 is divisible by 1, 2 and 3. And, 6 = 1 + 2 + 3.

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