of (C(38204629… Show more Use three of the IMPORTANT IDENTITIES to prove that the sum for k=0 to 38204629939869 of (C(38204629939869, k) / C(76409259878737, k)) =2 Not sure what the IMPORTANT IDENTITIES are: we know the formula for binomial coefficients: C(n,k) = ((n(n-1)…(n-k+1))/(k(k-1)…1)) = n!/(k!(n-k)!) and the sum of k=1 to n of k * C(n,k) = n*2^(n-1) thinking we need to use these identities… • Show less