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A sample of size 10 is chosen at random from a class of 100 consisting of 60 females and 40 males

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A sample of size 10 is chosen at random from a class of 100 consisting of 60 females and 40 males. Obtain the probability of getting 10 females. A box with 15 silicon chips contains five defectives. If a random sample of three chips is drawn at random, what is the probability that all three are defective?