Book Maths Puzzle Numerical Ability

Six points in a plane be joined in all possible ways by indefinite straight lines, and if no two of them be coincident of parallel and no three pass through the same point(with the exception of original 6).The number of distinct points of n is equals to

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Book Other Question

Everybody in a room shakes hands with everybody else.The total number of handshakes is 66.The total number of persons in a room is River is running at 2 kmph. It takes a man twice as long to row up as to row down the river. The rate of the man in still water is
a )6 kmph b) 4 kmph
c) 10kmph d) 8 kmph