There are five math cards, namely 5, 8, 3, 1, 4. Choose four of them and arrange them into a four-digit number. How many different four-digit numbers can you arrange?

1, choose four at will:

The first type: 5, 8, 3,1;

The second type: 5, 8, 3, 4;

The third type: 5,8, 1, 4;

The fourth type: 5,3, 1, 4;

Fifth: 8,3, 1, 4.

2. The first type: use 4 sets of cards: 5, 8, 3,/kloc-0;

(583 1、58 13、53 18、538 1、5 183、5 138; The number "5" starts with 6), and * * * has four that can start with:

* * * Four digits that can be composed: 6×4=24 (pieces)

3. A * * * can be arranged in different four digits: 24×5= 120 (pieces).