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The number of diagonals of a polygon of 15 sides is
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a
105
b
90
c
75
d
60
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Correct option is B
Number of diagonals =15C2−15=90Similar 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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