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When does the mathematical combination use plug-in method?
I am very studious here!

Insertion method of distribution problem

Example: 10 miyoshi students are divided into 7 classes, with at least one in each class.

C6,6

There will be seven classes, so you should divide111111into seven piles.

1111111/,understand?

Hey, he'll be divided into seven piles! Six knives, of course!