Lines lines lines
Probability
Level
2
There are 10 points in a plane exactly 4 of which are collinear find number of lines?
41
39
40
38
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1 solution
it's simple but tricky, answer is 10c2 - 4c2 +1 = 40 ,10c2 for no. of lines from all points ,4c2 for no. of lines from collinear which are identical ,and + 1 is as one line can be drawn from those collinear lines