![]() ![]() We know for sure that the series is going to take 4, 5, 6 or 7 games to complete. On average, the series will last about 5.8 games. It’s NBA Finals time! How many games would we expect to be needed to complete a best-of-seven series if each team has a 50 percent chance of winning each individual game? Submit your answer Solution to last week’s Riddler ExpressĬongratulations to □ Neema Salimi □ of Atlanta, winner of the previous Express puzzle! What strategy should you follow to maximize your chances of getting a nice payday? But that’s it - if you open a fourth envelope, you have to keep that check, no matter how paltry it is. And then you can keep the third check or throw it away and pick a fourth envelope. You can then keep that second check or toss it away and open a third envelope. You can then either keep that check, ending the game, or toss it away permanently and open another envelope. ![]() (As far as you know, the biggest check on the table could be $1.06 or it could be $98,765,432,100.00.) You may pick an envelope, open it and read the amount of the check. You are told that each envelope contains a check for an amount of money, each amount different from all the others, but you are given no other information about the distribution of amounts. You’re on a game show, and you’re asked to sit down at a table covered with sealed envelopes. From Dave Moran, a tricky take on a classic cash money problem:
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