If each child gives a farewell gift to every other child in a nursery, then the total number of gifts would be 650. How many children are there in the nursery?
Question
Solution 1
This problem can be solved using the formula for combinations in a set, which is n(n-1)/2, where n is the number of items in the set. In this case, the set is the number of children in the nursery, and we want to find out how many combinations of 2 (i.e., pairs of children) can be made.
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