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A person predicts the outcome of 20 cric...

A person predicts the outcome of 20 cricket matches of his home team. Each match can result in either a win, loss, or tie for the home team. Total number of ways in which he can make the predictions so that exactly 10 predictions are correct is equal to
a. `""^20 C_(10) xx 2^(10)`
b. `""^20 C_(10)xx3^(20)`
c. `""^20 C_(10)xx3^(10)`
d. `""^20 C_(10)xx2^(20)`

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