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2015 AMC 10B Problem 18

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2015 AMC 10B Problem 18AMC 10 Step by Step
Name:                             Date: September 13, 2026
Expected Value · difficulty 3 of 5 · about 2 min · position P16-20

Johann has 6464 fair coins. He flips all the coins. Any coin that lands on tails is tossed again. Coins that land on tails on the second toss are tossed a third time. What is the expected number of coins that are now heads?

  1. A)

    3232

  2. B)

    4040

  3. C)

    4848

  4. D)

    5656

  5. E)

    6464

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