1.

A fair coin it tossed 2n times. The probability of getting as many heads in the first n tosses as in the last n is

A. \[\frac{^{2n}{{C}_{n}}}{{{2}^{2n}}}\]
B. \[\frac{^{2n}{{C}_{n-1}}}{{{2}^{n}}}\]
C. \[\frac{n}{{{2}^{2n}}}\]
D. None
Answer» B. \[\frac{^{2n}{{C}_{n-1}}}{{{2}^{n}}}\]


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