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[" mark "r" as subyect of formula "],[A=...

[" mark "r" as subyect of formula "],[A=5cquad cR^(2)-r^(2)" ."]

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Probability if n heads in 2n tosses of a fair coin can be given by prod_(r=1)^n((2r-1)/(2r)) b. prod_(r=1)^n((n+r)/(2r)) c. sum_(r=0)^n((^n C_r)/(2^n))^2 d. (sumr=0n(^n C_r)^2)/(sumr=0 2n(^(2n)C_r)^)