Book Maths Puzzle

There are 8 points in a plane out of which 3 are collinear. How many straight lines can be formed by joining them?

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Book Other Question

How many quadrilaterals can be formed by joining the vertices of an octagon? In a birthday party, every person shakes hand with every other person. If there was a total of 28 handshakes in the party, how many persons were present in the party?