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+1 vote

A fair coin is tossed $n$ times. The probability that the difference between the number of heads and tails is $(n-3)$ is

  1. $2^{-n}$
  2. $0$
  3. $^{n}C_{n-3}2^{-n}$
  4. $2^{-n+3}$
in Probability & Statistics by (9.3k points)
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