In A few coins
, we learned about Levikland, in which the currency is perplexii. The coin values are 1, 2, 5, 10, 20, 50, and 100 perplexii.
How many perplexii can you have and still not be able to make change for a 100 perplexii coin?
The answer is 143 perplexii, since no collection of coins (out of the coins of various denominations summing to 143 p) can add up to 100 p.
Edited on November 7, 2007, 10:33 pm