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How many straight lines can be formed from 10 non-collinear points on the X-Y plane ?
45
40
54
60
For a straight line, we just need to select 2 points out of the 10 points available. 10C2 would be the number of ways of doing this. Therefore number of straight lines = 10C2 = 10!/2!8! = 45
By: bhavesh kumar singh ProfileResourcesReport error
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