There are n points in a plane no three of which are in the same line excepting p points which are collinear. The number of straight lines by joining them is
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a
nC2
b
nC2− pC2
c
(n−p)C2
d
nC2− pC2+1
answer is D.
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Detailed Solution
The number of straight lines by joining them is =nc2−pc2+1