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Permutations Practice Test 2
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© examsnet.com
Question : 7
Total: 30
Find the number of diagonals in a polygon with 20 sides.
80
90
85 diagonals
120
Cannot be determined
Validate
Solution:
Number of diagonals
=
n
(
n
−
3
)
2
=
20
(
20
−
3
)
2
= 85 diagonals
© examsnet.com
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