A bank plays the following game against a casino, for which the bank pays the casino a price $x to start playing. A coin is tossed repeatedly until it lands heads up. If heads appear on the first toss, the casino pays the bank $2, if head appears on the second toss, the casino pays the bank $4, if head appears on the third toss, the casino pays the bank $8 and so on.
How much should the bank be willing to pay the casino to start playing the game?
PROPOSITION A: The bank should play no matter how high the price $x is.
PROPOSITION B: The bank should only play if the price to start, $x, is less than the finite amount $.........
P(Heads appears on the nth toss) =
The casino pays $ to the bank
if heads appears on the nth toss
Thus, expected value of the bank's winnings
=
for n = 1,2,3,....... inf.
The sum tends to infinity
Thus, the bank should play no matter how high the price $x is.
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