c. Algebra Problems with nCr

D1-03 [nCr: Simplifying nCr Expressions]

D1-04 [nCr: Solving nCr Equations]

D1-05 [nCr: Algebraic Problem 1]

D1-06 [nCr: Algebraic Problem 2]

D1-07 [nCr: Algebraic Problem 3]