+0  
 
+2
100
3
avatar+165 

We call a number peachy if every digit in the number is either a 3 or next to a 3. For example, the numbers 83 and 131 are all peachy, but the numbers 304 and 31653 are not peachy.

How many positive 2-digit numbers are peachy?
 

 May 1, 2021
 #1
avatar+121000 
+2

13     23

30 - 39

43    53   63  83   83  93

 

18  such  numbers

 

 

cool cool cool

 May 1, 2021
 #2
avatar+165 
+3

Well, I just figured it out myself o_o
thanks anyways cphill!

 May 1, 2021
edited by viola  May 1, 2021
 #3
avatar+121000 
0

OK, viola....

 

 

cool cool cool

CPhill  May 1, 2021

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