self Maths Puzzle


There are 2 positive integers x and y. What is the probability that x+y is odd?

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self Other Question

Four boys and three girls stand in queue for an interview. The probability that they stand in alternate positions is?
Abhishek has 9 pairs of dark blue socks and 9 pairs of black socks. He keeps them all in the same bag. If he picks out three socks at random, then what is the probability that he will get a matching pair?