Discussion about math, puzzles, games and fun. Useful symbols: ÷ × ½ √ ∞ ≠ ≤ ≥ ≈ ⇒ ± ∈ Δ θ ∴ ∑ ∫ • π ƒ ¹ ² ³ °
 

You are not logged in. #1 20130323 11:55:27
Counting problems, please help...Bob built a Web site and gave the URL only to his n friends, which he numbered from 1 to n. He #2 20130323 12:01:43
Re: Counting problems, please help...Hi eagerlearner; In mathematics, you don't understand things. You just get used to them. I have the result, but I do not yet know how to get it. All physicists, and a good many quite respectable mathematicians are contemptuous about proof. #3 20130323 12:24:11
Re: Counting problems, please help...and what if "the maximum value of C" is required instead of mimum? #4 20130323 13:02:24
Re: Counting problems, please help...You reason about it like this: The bottom row shows the maximum amount they can use the site without exceeding their limit. 0 + 1 = 1. If C is 1 or less than no one has come in to many times. How about 3 friends: The maximum amout is 0 + 1 + 2 = 3 For 4 friends: The maximum number without anyone exceeding his limit is 0 + 1 + 2 + 3 = 6 For 5 friends: 0 + 1 + 2 + 3 + 4 = 10 if their is one more than this number than someone has reached his limit. Can you finish now? Last edited by bobbym (20130323 18:21:13) In mathematics, you don't understand things. You just get used to them. I have the result, but I do not yet know how to get it. All physicists, and a good many quite respectable mathematicians are contemptuous about proof. 