A bag contains 5 white, 7 red and 4 black balls. Four balls are drawn one by one with replacement. What is the probability that none is white?
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Because all are coloured.
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Total no. of balls=16total no. of non−white balls=11Probability of not getting a white ball in one step=11/16Since, the ball is put back (ie, re−placed), the probability of not getting a white ball will remain same every time.So, probability of drawing non−white balls 4 times=(11/16)^4=14641/65536
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