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How much zeros has the number $1000!$ at the end? If a number ends with n n zeros than it is divisible by 10n 10 n, that is 2n5n 2 n 5 n A factorial clearly has more 2 2 s than 5 5 s in its factorization so you only need to count how many 5 5 s are there in the factorization of 1000! 1000!
Expected value of a coin toss - Mathematics Stack Exchange You 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
Writing Out The Number of Zeros From 1 - 1,000,000 If you had to write out all the numbers between 1 and 1,000,000 How many zeros would you have to write in total I was given that the answer is 488,895 Can any one show the clearest way possible
What does X% faster mean? - Mathematics Stack Exchange I was reading something today that was talking in terms of 10%, 100% and 1000% faster I assumed that 10% faster means it takes 10% less time (60 seconds down to 54 seconds)
Find the sum of all the multiples of 3 or 5 below 1000 49 How to solve this problem, I can not figure it out: If we list all the natural numbers below 10 that are multiples of 3 or 5, we get 3, 5, 6 and 9 The sum of these multiples is 23 Find the sum of all the multiples of 3 or 5 below 1000
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 0 2242 Assuming exactly one prize is given, your answer of 1160 1 160 is the probability of winning is correct That is, you go home empty-handed with probability 159 160 159 160 However, 40 40 tickets are chosen for prizes, not just one So even if you miss out on a prize the first time, you could