In the number 1-33, randomly choose 6 digits so that the sum of 6 is 100. How many choices are there? What is the formula? Is this a permutation?

In the number 1-33, choose 6 numbers randomly, so that the sum of 6 numbers is 100, there are 19995 choices. The formula is more complex. It belongs to permutation and combination, but in the two-color ball, it mainly focuses on "combination"

Using the method of permutation and combination to calculate six poems, there are several kinds of silent methods

6
P =6x5x4x3x2x1=720
six

There are 18 numbers, take 6 numbers of permutation and combination, how many groups can you row? Thank you very much!

The number of permutations is 18 * 17 * 16 * 15 * 14 * 13 = 13366080
The combination number does not consider the order 18 * 17 * 16 * 15 * 14 * 13 / 1 / 2 / 3 / 4 / 5 / 6 = 18564

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