Book Maths Puzzle

Naresh has 10 friends and he wants to invite 6 of them to a party. How many times will 3 particular fiends never attend the party?

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Book Other Question

In a chess competition involving some men and women, every player needs to play exactly one game with every other player. It was found that in 45 games, both the players were women and in 190 games, both players were men. What is the number of games in which one person was a man and other person was a woman? In how many ways can seven '#' symbol and five '*' symbol be arranged in a line so that no two '*' symbols occur together?