1.

A fair die is thrown twenty times. The probability that on the tenth throw the fourth six appears is

A. \[\frac{^{20}{{C}_{10}}\times {{5}^{6}}}{{{6}^{20}}}\]
B. \[\frac{120\times {{5}^{7}}}{{{6}^{10}}}\]
C. \[\frac{84\times {{5}^{6}}}{{{6}^{10}}}\]
D. None of these
Answer» D. None of these


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