Identifying perfection
Which of the following are perfect numbers:
A.
B.
C.
D.
This problem is the part of a set on perfect numbers .
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divisors of 9: 1, 3,9 but (1+3+9)/2 is not equal to 9 therefore, 9 is not a perfect no. divisors of 28: 1,2,4,7,14,28 and (1+2+4+7+14+28)/2=28 therefore, 28 is a perfect no. divisors of 496: 1,2,4,8,16,31,62,124,496 and (1+2+4+8+16+31+62+124+496)/2=496 therefore, 496 is the perfect no. ans: B and C