Homework Help: PROBABILITY QUESTION PLEASE HELP!!

Posted by PLEASE HELP on Sunday, November 25, 2012 at 3:45pm.

Three people play a game of "nonconformity": They each choose rock, paper, or scissors. If two of the three people choose the same symbol, and the third person chooses a different symbol, then the one who chose the different symbol wins. Otherwise, no one wins.

If they play 4 rounds of this game, all choosing their symbols at random, what's the probability that nobody wins any of the 4 games? Express your answer as a common fraction.

PLEASE HELP this is so hard I do not have any idea because I fail at probability. How do we do this?!

PROBABILITY QUESTION PLEASE HELP!! - bobpursley, Sunday, November 25, 2012 at 3:52pm
Pr=1-prwinning=1=- 1*1/3*2/3=1-2/9=7/9 is probablility of no one winning each game

Pr this happening four games= that to the 4th power, or (7/9)^4 = about .366
PROBABILITY QUESTION PLEASE HELP!! - Answer!!, Sunday, December 30, 2012 at 7:01pm
First, we compute the total number of possible outcomes for each round. Each person can choose any of three different symbols, so the total number of possible outcomes is .

Now, we compute the number of outcomes in which no one wins. No one wins if all three symbols are the same (3 ways, one for each symbol), or each person presents a different symbol ( ways), so there are outcomes in which no one wins.

Therefore, the probability that no one wins a given round is . This means the probability that no one wins any of four rounds is .

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