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Number of 6's between 1 to 18000  TOPIC_SOLVED

Is there a smart way to solve this..?

I can see a brute force type of way.... by looking at the number of 6's from 1-100, then 101 to 200 etc... and special cases for 601-700 etc... but it seems very long, tedius and prone to error?

Thanks for any ideas.
by Numeroprime
on Wed Jul 14, 2010 10:40 pm
 
Forum: Arithmetic
Topic: Number of 6's between 1 to 18000
Replies: 4
Views: 2205

Re: Number of 6's between 1 to 18000  TOPIC_SOLVED

Thanks!

That was my guess, but I was hoping for a motrin free method.... Patterns makes sense and its a good exercise.

Mahalo,

Tory
by Numeroprime
on Wed Jul 14, 2010 11:12 pm
 
Forum: Arithmetic
Topic: Number of 6's between 1 to 18000
Replies: 4
Views: 2205

Re: Number of 6's between 1 to 18000  TOPIC_SOLVED

One of my classmates got the same answer as presented by Dr. Andrew.... using the pattern method: how many 6's from 1-100, how many from 1000-1999 etc... and making use of the special case where the first number is 2. When I tried Dr. Andrews method for the text question: How many zeros from 1 to 1,...
by Numeroprime
on Wed Jul 21, 2010 8:26 pm
 
Forum: Arithmetic
Topic: Number of 6's between 1 to 18000
Replies: 4
Views: 2205

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