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 Jan 25 accepted Expected number of days of watching movie Jan 24 comment Expected number of days of watching movie Could you provide an explanation or answer on how to apply linearity of expectation , as I have tried to apply it but no success so far . Jan 24 comment Expected number of days of watching movie If I know the probability for x days would not the expectation be x*p(x) ? Jan 24 comment Expected number of days of watching movie Ok , I mean is what is the probability all movies have been watched after x days . Is it clear now ? Jan 24 comment Expected number of days of watching movie What I mean is the expected number of days I have to choose and watch movies such that all are watched . Jan 24 comment Expected number of days of watching movie The probability is independent , that is the probability of choosing any three movies would be $p^3$ . Jan 24 asked Expected number of days of watching movie Aug 2 comment How to check if $\text{position}\left(\frac{a + b} 2\right )$ is in range $\text{position}\left(a\right )$ and $\text{position}\left(b\right )$ Simiar to this problem I guess , codeforces.com/contest/452/problem/F . (Note : This is from an already completed contest) Jul 17 comment $k$-th number in $N \times M$ Table $n(p)$ can be found in $O(M)$ or $O(N)$ complexity . Jul 17 awarded Teacher Jul 17 answered $k$-th number in $N \times M$ Table Jul 8 comment Find sum of all permutations This is a problem from an ongoing contest . Kindly close the question until the contest is over. codechef.com/JULY14/problems/SEAEQ Jul 6 comment Counting maximum moves Problem is from ongoing contest codechef.com/JULY14/problems/GNUM . Kindly close the question until the contest is Over. Jul 6 comment Distributing cards among players This is a problem from an ongoing contest codechef.com/JULY14/problems/LUCKG . Kindly put this question on hold until the contest is over. Jul 2 awarded Curious Jun 29 awarded Popular Question May 12 awarded Popular Question May 10 awarded Good Question Apr 9 comment Find all subsets whose sum modulo a value is 0. Please close this question till the contest gets over. This is an ongoing contest problem codechef.com/APRIL14/problems/ANUCBC . Apr 5 comment Count Integers satisfying the conditions Please close this question as it is a ongoing contest problem. codechef.com/APRIL14/problems/CNPIIM