Question 388986: A three-digit positive number is picked at random. What is the probability that the sum of its digit is equal to 24? Give your answer as a common fraction in lowest terms?
I have another question here.
Flip a fair coin, If it lands heads, write an H and the turn is done. If it lands tails, then flip it again-write H if it lands heads or T if it lands tails, and the turn is done. After 6 tunrs, what is the probability that 6 H's have been written? Express your answer as a common fraction.
Answer by stanbon(75887)   (Show Source):
You can put this solution on YOUR website! A three-digit positive number is picked at random. What is the probability that the sum of its digit is equal to 24? Give your answer as a common fraction in lowest terms?
Successful patterns:
888,879,897,789,798,987,978,699::::8 ways to succeed
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Random Patterns:
9 ways to select the 100rds digit;
10 ways to select the 10s digit
10 ways to select the units digit
# of random 3 digit numbers 900
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P(sum is 24) = 8/900
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I have another question here.
Flip a fair coin, If it lands heads, write an H and the turn is done. If it lands tails, then flip it again-write H if it lands heads or T if it lands tails, and the turn is done. After 6 tunrs, what is the probability that 6 H's have been written? Express your answer as a common fraction.
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P(H) = done
P(T??
??????
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Cheers,
Stan
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