For each element in a set of size 2n, an unbiased coin is tossed. The 2n coin…
GATE · 2006 · CS
For each element in a set of size 2n, an unbiased coin is tossed. The 2n coin tosses are independent. An element is chosen if the corresponding coin toss is a Head. The probability that exactly n elements are chosen is:
- A.
C(2n, n) / 4^n
- B.
C(2n, n) / 2^n
- C.
1 / C(2n, n)
- D.
1/2
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Correct answer: A
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