How many straight line can be drawn from 15 non collinear points?
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The answer is 105
Explanation:
Since here we have to chose/ select the points from which we have to draw lines, we have to use concept of combinations.
We know that a line needs two points (i.e) the starting point and the ending point.
Therefore according to combinations, the formula is nCr.
We have to select 2 points from 15 non-collinear points to draw a straight line. ( Remember that collinear points is conditional )
Hence, the answer is 15C2 = (15)(14)/(1)(2)
= 105
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