+0  
 
+1
141
1
avatar+3446 

How many of the 343 smallest positive integers written in base 7 use 4 or 5 (or both) as a digit?

tertre  Feb 11, 2018
 #1
avatar
0

343 in base 10 = 1,000 in base 7

I count 38 fours and 37 fives out of 343_7 numbers. You can count  them yourself by listing them and you will see a pattern: 0,1,2,3,4,5,6......, 10,11,12,13,14,15,16........., 20,21,22,23,24,25,26......, 30,31,32,33,34,35,36.......and so on. Now, you can see the pattern.

Guest Feb 11, 2018

5 Online Users

avatar
avatar

New Privacy Policy

We use cookies to personalise content and advertisements and to analyse access to our website. Furthermore, our partners for online advertising receive information about your use of our website.
For more information: our cookie policy and privacy policy.