in a group of children each child gives gifts to others.if the no of gifts is 132 find the no of children

Asked by  | 5th Mar, 2013, 01:24: PM

Expert Answer:

Let there are n children,then each of them will give (n-1) gifts 
n^2 - n = 132 
n^2 - n -132 = 0 
(n - 12) * (n + 11) = 0
n - 12 = 0 or n + 11 = 0
n = 12, -11
Since number of children cant be negative, so n = 12
Thus, the number of children is 12.

Answered by  | 5th Mar, 2013, 10:03: PM

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