plz write step by step and explain

J A An urn contains T White Chips, 5 Red Chips and 3 Blue Chips. We will now select four chips without replacement. Determine the following probabilities. 1] P {Exactly 3 chips are white} 2] P {The third chip is red I The rst 2 were white} 3] P {The fourth chip is blue I the first 2 were white]