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There are 21 points in a plane no t...

There are 21 points in a plane no three of which are collinear . The number of triangle by joining them is

A

1330

B

210

C

1850

D

180

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The correct Answer is:
A
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DIPTI PUBLICATION ( AP EAMET)-PERMUTATIONS & COMBINATIONS-EXERCISE 1B (COMBINATIONS )
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