@ @pbjïØ Üa@ @UV B () () B () . () C(8,2) = 8 ! = 28 8 2!×6! () B .C(7,1) = 7 3. () .C(8, 3) = 8 ! = 56 8 3!× 5! B () . .C(7,2) = 7 ! = 21 2!× 5! [Permutations with Indistinguishable Objects] ) .( () summertime