+0  
 
0
470
3
avatar

Nigel has a stack of 4 and 5 pence stamps. What is the largest number of pence that he cannot make up by using these stamps?

 Jun 28, 2016
 #1
avatar+564 
0

https://en.wikipedia.org/wiki/Coin_problem

 

According to wikipedia: "With only 2 pence and 5 pence coins, one cannot make 3 pence, but one can make any higher integral amount."

 

So the answer is three..?

 Jun 29, 2016
 #2
avatar+7372 
0

3 pence. It's impossible to make 3 pence with 4 and 5 pence stamps.

 Jun 29, 2016
 #3
avatar
0

Actually, it's 11 pence.

11=4+4+3

 

numbers greater than 11 can be made with 4x+5y; x, y>0

 Aug 10, 2016

17 Online Users

avatar
avatar