Question

how many straight lines can be drawn using six points (a, b, c, d, e and f), in which no three points are collinear?a. 5b. 8c. 10d. 15

Answer 1

Remember that

For making straight lines 2 non -collinear points are required

so

Calculate 6C2

$6C2=\frac{6!}{2!(6-2)!}=15$

The answer is option d