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There are 20 points in plane no thre...

There are 20 points in plane no three of which are collinear . The number of strainght lines by joining them is

A

190

B

200

C

40

D

500

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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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