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its own is always

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its own is always

by sanju09 » Sat Mar 06, 2010 6:15 am
If the sum of the divisors of a positive integer n excluding n itself is equal to n, then n is called a Perfect Number. The sum of the reciprocals of the divisors of a Perfect Number including that of its own is always
(A) 1
(B) 2
(C) 3
(D) 4
(E) 5
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by rohan_vus » Sat Mar 06, 2010 6:21 am
Its about acase which is always true then lets start with any perfect number
6 is one of them , it has 1,2 and 3 as factors
Sum of reciprocals = 1+1/2+1/3+1/6 = 2

So B
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