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Lucas

3.A,B,C,D and E are the different pointson the circumference of a circle .How many triangles maybe drawn through these points.?2)Banti had some amount of money.After spending Rs.30,23of his initial amount was left with him.What amount of money was left with him?​

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Answer:

Triangle has three vertices, so we have to connect three points out of ten points to form a triangle, so number of ways three points can be selected from ten points is

10

C

3

.

Heptagon has seven vertices, so we have to connect seven points out of ten points to form a heptagon. So number of ways seven points can be selected from ten points is

10

C

7

.

The difference of those two is

10

C

3

10

C

7

=120−120=0.

479
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