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Grade: 12th Pass
        there are 10 points ina aplane of which 3 are collinear.how many straight lines wecan drawn ?
7 years ago

Answers : (2)

Vaishal Shah
50 Points
							10c2-3c2+1
where c is combination
=45-3+1
=43
						
7 years ago
Aman Bansal
592 Points
							

Dear Mangati,

Case 1: We choose two of the four collinear points. Here, only one line is determined because we cannot count 4C2 lines (they are all the same). 

Case 2: We choose two of the six other non-collinear points. Here, it is simply choosing any two points out of 6, 6C2 = 15. 

Case 3: We choose one of the four collinear points, and one of the six remaining points. There are 4*6 = 24 lines determined, no two of which are collinear. 

The number of lines is 1+15+24 = 40. 

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7 years ago
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