Ajar contains 5 blue marbles and 3 red marbles. suppose you choose a marble at random and do not replace it. then choose a second marble. find the probability of the following event. both of the selected marbles are red.

The probability of drawing a red marble on the first attempt is



After the first marble is drawn, and we know it to be red, we're drawing the next marble from a pool with one less marble than before (i.e. conditioning on the event ). So



And so

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