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Bookmark or Share- Expected value of a coin toss - Mathematics Stack ExchangeYou flip a coin. If you get heads you win \\$2 if you get tails you lose \\$1. What is the expected value if you flip the coin 1000 times? I know that the expected value of flipping the coin once i...
- How many numbers between 1 and 1000 are divisible by 2, 3, 5 or 7?The totient of $210$ - the number of values between $1$ and $210$ that are relatively prime to $210$ - is $(2-1)(3-1)(5-1)(7-1)=48$.
- combinatorics - Probability of winning a prize in a raffle ...You'll be surprised. The correct probability of winning at least one ticket is around $0.2242$. Assuming exactly one prize is given, your answer of $\frac{1}{160}$ is the pr
- What does it mean when something says (in thousands)I'm doing a research report, and I need to determine a companies assets. So I found their annual report online, and for the assets, it says (in thousands).
- Solution Verification: How many positive integers less than $1000$ have ...A positive integer less than $1000$ has a unique representation as a $3$-digit number padded with leading zeros, if needed. To avoid a digit of $9$, you have $9$ choices for each of the $3$ digits, but you don't want all zeros, so the excluded set has count $9^3 - 1 = 728$. Hence the count you want is $999 - 728 = 271$.
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