Hello,
Your problem is equivalent to finding the greatest n such that divides 2008!
Read this thread : http://www.mathhelpforum.com/math-he...1412-mods.html
Hello,
Your problem is equivalent to finding the greatest n such that divides 2008!
Read this thread : http://www.mathhelpforum.com/math-he...1412-mods.html
i used that method to find the number of 5s in 2008!
i supposed that any number that ends with zero is divisible by 10, which is 2x5. meaning i have to calculate the number of parings of 2 and 5 with all the numbers from 1 to 2008. number of two > number of five. so i find the number of fives in 2008! and i got that there are 500 fives in 2008! concluding there are 500 zeroes in 2008! but the answer's 200 zeroes.