N_P_n = N(N-1)...(N-(n-1)) = N!/(N-n)!, eqs (1.5)-(1.6). The falling
product and the factorial quotient are both formed and must agree.
Arguments
- N, n
pool size and subgroup size, 0 <= n <= N.
Value
list(n_objects, n_picks, count, forms_agree).
References
Morin, D. J. (2016). Probability: For the Enthusiastic
Beginner. Createspace. Eqs. (1.5)-(1.6).
Examples
OrdSubs(5, 5)$count
#> [1] 120
