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There are three nickels and four nickels. How many different kinds of money can you make up? Write your method. (Math problems in primary schools)
There are 19 species.

Three pence: 2 cents, 4 cents, 6 cents,

4 nickels: 5 cents, 10 cents, 15 cents, 20 cents,

The combination of two cents and four nickels in different quantities: 2 points, 12 points, 17 points, 22 points.

In turn: 9 points, 14 points, 19 points, 24 points;

1 1, 16, 2 1, 26.