Question 48387: I am really confused with this one. The book doesn't offer enough explanation. Please help...
Calculate the probability of the event
Four digits are selected from the digits 1,2,3,4 and a number is formed. Find the probability that the number is greater thaan 3000, assuming digits can be repeated.
Answer by stanbon(75887)   (Show Source):
You can put this solution on YOUR website! Four digits are selected from the digits 1,2,3,4 and a number is formed. Find the probability that the number is greater than 3000, assuming digits can be repeated.
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The thousands digit must be either 3 or 4: 2 ways to choose
The remaining three digits may be chosen is 4^3=64 ways
Answer 2*64=128
Cheers,
Stan H.
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