A fair die is thrown twenty times. The probability that on the tenth throw the fourth six appears is:
  • A$\frac{\text{ }^{20}\text{C}_{10}\times5^6}{6^{20}}$
  • B$\frac{120\times5^7}{6^{10}}$
  • C$\frac{84\times5^6}{6^{10}}$
  • D
    None of these
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