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JAMB - Mathematics (1987 - No. 22)
An (n - 2)
2
sided figure has n diagonals. Find the number n diagonals for 25-sided figure
7
8
9
10
解释
(n - 2)
2
= 25
n - 2 = 25 = 5
n = 5 + 2
= 7
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