Geometric Distribution and Base R

Course X counts trials until first success: 1,2,...
Base R counts failures before first success: 0,1,...
P(course X=x): dgeom(x-1,prob=p)
P(course X<=x): pgeom(x-1,prob=p)
Simulation: rgeom(size,prob=p)+1
Course mean: 1/p; variance: (1-p)/p^2.

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