If points (1,2),(-5,6) and (a,-2) are collinear, then a= (a) -3 (b) 7 (c) 2 (d) -2 W

If points (1,2),(-5,6) and (a,-2) are collinear, then a=
(a) -3
(b) 7
(c) 2
(d) -2
W

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