Questions
The number of diagonals in a polygon of m sides is
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a
12!m(m−5)
b
12!m(m−1)
c
12!m(m−3)
d
12!m(m−2)
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Correct option is C
Required number of diagonals=mC2−m=m(m−1)2!−m=m2!(m−3)Similar Questions
There arepoints in a plane, no two of which are in a straight line except 4, all of which are in a straight line. The number of triangles that can be formed by using these points is
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