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A die has 9 faces, numbered from 1 to 9 and every number has the same chance of appearing. You roll the die and write the numbers down, one after another, and stop when you write down a multiple of 3. For example, suppose you roll 2 then 3 then 7. You would stop here, because 2 and 23 are not multiples of 3 but 237 is a multiple of 3. Find the expected number of rolls.

 Apr 17, 2021
edited by Guest  Apr 17, 2021
 #1
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Am I supposed to roll a die to help with this problem?

 Apr 17, 2021
 #2
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What is the thing your trying to find out?

Guest Apr 17, 2021
 #4
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 Apr 21, 2021

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