[" (a) "60],[" There are "12" points in ...

[" (a) "60],[" There are "12" points in a plane.The number of the straight lines joining any two of them "],[" when "3" of them are collinear,is "],[[" (a) "62," (b) "63],[" Three persons enter a railway compartment.If there are "5" seats vacant in the "]]

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