Created
March 7, 2017 23:43
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| from itertools import combinations | |
| b=int(input()) | |
| a=input().split() | |
| c=int(input()) | |
| a=''.join(sorted(a)) | |
| a_count=0 | |
| for i in combinations(a,c): | |
| if 'a' in i:a_count+=1 | |
| print ("%0.3f" %(a_count/len(list(combinations(a,c))))) |
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