Coupon Collector's Problem
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.
References
Hildebrand, M. V. ``The Birthday Problem.'' Amer. Math. Monthly 100, 643, 1993.
- Exponential Integral
- Exponential Map
- Exponential Matrix
- Exponential Ramp
- Exponential Sum Formulas
- Exponential Sum Function
- Exponent Laws
- Exponent Vector
- Exradius
- Exsecant
- Extended Cycloid
- Extended Goldbach Conjecture
- Extended Greatest Common Divisor
- Extended Mean-Value Theorem
- Extended Riemann Hypothesis
- Extension
- Extension Problem
- Extensions Calculus
- Extent
- Exterior
- Exterior Algebra
- Exterior Angle Bisector
- Exterior Angle Theorem
- Exterior Derivative
- Exterior Dimension