12 Zodiac Courtyard 3 How many groups are there in Lian Xiao?

12 Zodiac Compound Three Zodiac Pairs can give birth to 220 groups. This is a question of permutation and combination. The so-called arrangement refers to taking out a specified number of elements from a given number of elements for sorting. Combination refers to taking out only a specified number of elements from a given number of elements, regardless of sorting. The central problem of permutation and combination is to study the total number of possible situations in a given permutation and combination. Three zodiac signs *** 12 can be combined into three-in-one to match 220 groups.