can someone help me with the probability calculation part in this question?

Revision en1, by om1429888, 2022-08-11 17:05:01

for the first test case im getting 7/16 but it should be 7/8 basically im doing summation of 1/n*1/k*1/n*fre(y)/n. https://mirror.codeforces.com/contest/1279/problem/D

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