Let 
objects be picked repeatedly with probability 
that object 
is picked on a given try, with
 |
Find the earliest time at which all 
objects have been picked at least once.
Coupon Collector's Problem
See also
Birthday ProblemExplore with Wolfram|Alpha
References
Hildebrand, M. V. "The Birthday Problem." Amer. Math. Monthly 100, 643, 1993.Referenced on Wolfram|Alpha
Coupon Collector's ProblemCite this as:
Weisstein, Eric W. "Coupon Collector's Problem." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/CouponCollectorsProblem.html