1.

There are n points in a plane no three of which are in the same straight line with the exception of m(n>m)points which are all in the same straight line. Find the number of triangles formed by joining them.

Answer»

`""^(N-m)C_3`
`""^(n)C_3 -""^(m)C_3`
`""^(n)C_m`
NONEOF(a),(B ),(C )

ANSWER :B


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