Randomly select four cards from A-9 of a deck of playing cards. * * * How many ways can I take? How many of them can calculate 24 points?

There are four colors of cards. Take four cards from A~9***36 cards, * * C36 (4) = 36 * 35 * 34 * 33 =1413720.

Combinations that can't be counted as 24 are: for example,111.

111216 species: C4(3)C4( 1)

111316 Category: .....

..

...

Nine thousand nine hundred and ninety-nine

* * * Yes: 16046 combination is not 24.

The combinations that can be calculated are:1413720-16046 =1397674. Four combinations can be calculated as 24,

Columns 2, 3, 4 and 5 can calculate 4*(5+3-2)=24, and each number .2345 has four colors.

There are: C4 (1) * C4 (1) * C4 (1) * C4 (1) = 256 combinations, and so on.