About playing cards at 24 o'clock

The content of the game "Clever 24 Points" is: take 52 cards from a deck of cards, randomly draw 4 cards (called a deck of cards) (only 40 cards of 1 ~ 10 can be used for initial training), and count the number on a deck of cards as 24 through addition, subtraction, multiplication and division (brackets can be added). Each card can only be used once. If the cards drawn are 3, 8, 8, 9, then the formula is (9-8) × 8× 3 or 3× 8+(9-8) or (9-8 ÷ 8 )× 3 and so on.

As a poker intelligence game, Count 24 points should also pay attention to skills in calculation. When calculating, it is impossible for us to try different combinations of the four numbers on the card surface, let alone touch them together. Here are some common methods that are easy to learn and master:

1. Solve with 3× 8 = 24 and 4× 6 = 24.

Try to sum the four numbers on the card face into 3 and 8, 4 and 6, and then multiply them to solve. For example, 3,3,6 and 10 can form (10-6 ÷ 3) × 3 = 24, etc. For example, 2, 3, 3 and 7 can form (7+3-2) × 3 = 24 and so on. Practice has proved that this method has the highest utilization rate and hit rate.

2. Use the operational characteristics of 0, 1 1 to solve it.

For example, 3, 4, 4 and 8 can form 3× 8+4-4 = 24. For another example, 4,5, j and k can form11× (5-4)+13 = 24 and so on.

3. In the deck with solutions, the following six solutions are widely used: (We use A, B, C and D to represent the four numbers on the deck)

①(a—b)×(c+d)

Such as (10-4) × (2+2) = 24, etc.

②(a+b)÷c×d

Such as (10+2) ÷ 2× 4 = 24, etc.

③(a-b÷c)×d

Such as (3-2 ÷ 2) × 12 = 24, etc.

④(a+b-c)×d

Such as (9+5-2) × 2 = 24, etc.

⑤a×b+c—d

Such as1/kloc-0 /× 3+l-10 = 24, etc.

⑥(a-b)×c+d

Such as (4-L) × 6+6 = 24, etc.

When playing games, students might as well try it according to the above methods.

It should be noted that four cards (52 cards) in a deck can be randomly selected to have 1820 different combinations, among which 458 cards can't be counted as 24 points, such as A, A, A and 5.