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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?

Guest Jun 28, 2016
 #1
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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..?

chilledz3non  Jun 29, 2016
 #2
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3 pence. It's impossible to make 3 pence with 4 and 5 pence stamps.

MaxWong  Jun 29, 2016
 #3
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Actually, it's 11 pence.

11=4+4+3

 

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

Guest Aug 10, 2016

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