A7 How many ways are there to pay a bill of 5 euros using 1 euro and 2 euro coins?
(A) 1 way
(B) 2 ways
(C) 3 ways
(D) 4 ways
(E) 5 ways
A7 The account can be paid in three ways:

- with five 1 EUR coins,
- with two 2 EUR coins and one 1 EUR coin,
- with one 2 EUR coin and three 1 EUR coins.