Expected number of steps till a random walk hits a or -b.
32056
Symmetric random walk with bounds
115338
Example: satisfying $E(X_{n+1}\mid X_n)=X_n$ but not a martingale
132392
Properties of Expectation
126655
Expected Sum of n numbers after m random opeartions on n numbers.
48358
Probability of asymmetric random walk returning to the origin
90666
Finding an example of a discrete-time strict local martingale.
23246
Challenge question; How do I prove the expected value of the following?
67328
Expected value of the number of flips until the first head
148979
Expected hitting times for simple random walk on a hypercube
138178
Proving the number of iterations in the Euclidean algorithm
149705
Find expected number of successful trail in $N$ times
102505
Expected number of (0,1) distributed continuous random variables required to sum upto 1
123844
conditional expectation: an implication
68979
Expected Value of Flips Until HT Consecutively
13799
Average Length of Random Number Generation with Decreasing Range of Numbers
54207
Pseudo-random number generator
33594
Expected value of average of Brownian motion