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Math problem, if there are six balls, take them twice and don't put them back, one at a time, then how many ways are there? What's the difference between C62 and C6 1 times C5 1?
* * * There are C62 species, namely 15 species.

C62 is equal to 6*5/2= 15.

C6 1*C5 1 equals 6*5=30.

The difference between them lies in the change of order.

C62 can change the order. For example, six balls are not. 123456, the collar number 16 is the same as NO. 6 1.

C6 1*C5 1 is fixed. Yes, including 6 1 and 16.

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