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Permutations Practice Test 2
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© examsnet.com
Question : 1
Total: 30
A polygon has 44 diagonals, then the number of its side are:
11
7
8
None of these
Validate
Solution:
If n is the number of sides, then the no. of diagonals
=
n
C
2
−
n
=
44
1
2
n
(
n
−
1
)
−
n
=
44
⇒
(
n
−
11
)
(
n
+
8
)
=
0
⇒
n
=
11
.
(
∵
n
≠
−
8
)
© examsnet.com
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