verified to pass 2026
r-combination - correct answer ✔N!/R!(N-R)!
r-permutation - correct answer ✔N!/(N-R)!
r-Permutation with repetition - correct answer ✔N^R
r-Combination with repetition - correct answer ✔
Permutation with indistinguishable objects - correct answer ✔N!/(n1!*n2!*n3!....nk!)
Binomial Theorem - correct answer ✔