Q.

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

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a

1330

b

210

c

1850

d

180

answer is A.

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Detailed Solution

The number of triangles  formed by joining them is =21c3=1330
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Get ₹ 1 crore* worth scholarship for JEE / NEET / Foundation
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