Question: In Problem 70, suppose that the coin is tossed n times. Let X denote the number of heads that occur. Show that P{X = i}

In Problem 70, suppose that the coin is tossed n times. Let X denote the number of heads that occur. Show that

P{X = i} = 1/n + 1 i = 0, 1, . . . , n

Make use of the fact that

when a and b are positive integers.
Problem 70
Consider an urn containing a large number of coins, and suppose that each of the coins has some probability p of turning up heads when it is flipped. However, this value of p varies from coin to coin. Suppose that the composition of the urn is such that if a coin is selected at random from it, then the p-value of the coin can be regarded as being the value of a random variable that is uniformly distributed over [0, 1].

-1(1 -p"-Idx= (a-1)!(b-1)! (a +b 1)!

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