A fair coin is tossed 4 times. what is the probability that at most 3 tails occurs
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U must approach through the question by applying Bernaaulli trials...
nCr = nCr (P) ^r*(Q) ^n-r.
For four trials n=4 and r must be <=3 i. e 0, 1, 2, 3
nCr = nCr (P) ^r*(Q) ^n-r.
For four trials n=4 and r must be <=3 i. e 0, 1, 2, 3
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