+0  
 
0
51
1
avatar

You received another calculator gift over the holidays. It has only two keys: a  +1 key and a  x5 key. The number 1 appears on your display. Describe a sequence of eleven key punches  that you can use to make the year  2020 appear on the display?  

 Jun 7, 2020
 #1
avatar+109806 
+1

work backwards from 2020

remember if you go backwards then you can -1 and divide by 5

It falls out easily.

 

Once you can do it backwards you can then reverse everything and do it forwards.

 

Please no one provide a fuller answer. Guest needs to do some thinking on his/her own.

 Jun 7, 2020

15 Online Users

avatar
avatar