How many can straight lines be drawn from 15 non-collinear points ?



How many can straight lines be drawn from 15 non-collinear points ?

A. 105

B. 120

C. 110

D. 115

E . 118

Answer : A. 105


Explanation:

    Required number of lines
    = nC2 = 15C2
    = 15 x 14 / 2 = 105


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