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Two players P1a n dP2 play a series of...

Two players `P_1a n dP_2` play a series of `2n` games. Each game can result in either a win or a loss for `P_1dot` the total number of ways in which `P_1` can win the series of these games is equal to
a. `1/2(2^(2n)-.^(2n)C_n)`
b.`1/2(2^(2n)-2xx.^(2n)C_n)`
c. `1/2(2^n-.^(2n)C_n)`
d. `1/2(2^n-2xx.^(2n)C_n)`

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