exam Maths Puzzle Numerical Ability

find the probability of pulling out a heart and then a dimond from a standard 52 card deck with a) replacement and b) with out replacement

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exam Other Question

The volume V of a gas varies inversely as the pressure P on it. The volume of a gas in 240 cm^3 under a pressure of 23kg/cm^2. What will be its volume under a pressure of 30kg/cm^2? If x=3 and x=5, then form a quadratic equation