# Q.12.  A fair coin is tossed 9 times the probability that at least 5 consecutive heads occurs is (A) $\frac{5}{64}$ (B) $\frac{3}{32}$ (C) ${}^{9}C_{5}{\left(\frac{1}{2}\right)}^{n}$ (D) $\frac{5}{{2}^{9}}$

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