Q11:
Mary persuaded n friends to donate $500 each to her election campaign, and then each of these n friends persuaded n more people to donate $500 each to Mary’s campaign. If no one donated more than once and if there were no other donations, what was the value of n?
(1) The first n people donated 1/16
(2) The total amount donated was $120,000.
my line is this:
1.500n=1/16(500n+500n^2),n=15
2.500n+500n^2=120000,n=15
so the right answer is d,is it right?
条件(1)
N可以是0。
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