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Math problems in the third grade of primary school (permutation and combination)
Binding Ding first is equivalent to three people sorting, so A33=6 kinds.

Then, there are two kinds of butyl.

So 6*2= 12.

meeting point

A, B and D.

Ethyl methyl propyl butyl

Ethyl methyl butyl propyl

Methyl propyl butyl ester

Butyl butyl propyl ethyl

Ethyl propylene butyl methyl ester

Ethyl butyl propyl methyl

Butyl a and butyl b

Ding bing Jia yi

Propyl butyl ethyl ester

Butyl ethyl ester

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