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A fair die is thrown 20 times. The proba...

A fair die is thrown 20 times. The probability that on the 10th throw, the fourth six appears is
a.`(.^20 C_(10)xx5^6)/6^(20)`
b. `(120xx5^7)/6^(10)`
c. `(84xx5^6)/6^(10)`
d. none of these

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CENGAGE PUBLICATION-PROBABILITY-All Questions
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