Saturday, February 9th, 2013
Question : The sum of the reciprocals of the positive divisors of 120 ?
a.2
b.3
c.4
d.6
Answer :Â
Sum of its factors = (1 + 2 + 4 + 8)(1 + 3)(1 + 5) = 360
Sum of the reciprocals of its factors = 360 / 120 = 3
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