10C3 i.e, no.of selections 3 points that can be made from i.e 10!/(3!*7!)=120
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Radha Muchhala answered this
No, because each diagonal has been counted twice (once starting with one of its ends and one starting with the other.) There are therefore ½ of 70, i.e. 35 diagonalsin a decagon. Generally, a polygon with n sides has ½n(n-3) diagonals: none for a triangle, 2 for a quadrilateral, 5 for a pentagon, 9 for a hexagon etc.
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Ansh H Mehta answered this
No, because each?diagonal?has been counted twice (once starting with one of its ends and one starting with the other.)?There?are therefore ? of 70, i.e. 35?diagonalsin a decagon. Generally, a?polygon?with n?sides?has ?n(n-3)?diagonals: none for a triangle, 2 for a quadrilateral, 5 for a pentagon, 9 for a hexagon etc.
