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A certain coin is tossed with probability of showing head being 'p'. Let 'q' denotes the probability that when the coin is tossed four times the number of heads obtained is even. Then |
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Answer» there is no value of `p`, if `q=(1)/(4)` `:.q=p^(4)+^(4)C_(2)p^(2)(1-p)^(2)+(1-p)^(4)` `=8p^(4)-16p^(3)+12p^(2)-4p+1` `=((2p-1)^(4)+1)/(2)` Now put the values and check. |
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