Question

List all the combinations of four objects m comma l comma n comma and k taken two at a time. What is 4 Upper C 2?? List all the combinations of four objects m comma l comma n comma and k taken two at a time. Choose the correct answer below. A. mm comma ml comma mn comma md comma ll comma ln comma lk comma nn comma nk comma kk nothing B. ml comma mn comma mk comma ln comma lk comma nk C. ml comma mn comma mk comma lm comma ln comma lk comma nm comma nl comma nk comma km comma kl comma kn nothing D. m comma l comma n comma k What is 4 Upper C 2??

Answer 1

The combinations of four objects m,l,n and k taken two at a time are:

ml,mn,mk,ln,lk, nk.

Therefore B) is the correct choice.

Combination is an arrangement of p symbols taken q at a time, where order in which the symbols taken have no important.

The formula for the number of combination of p objects taken q at a time is given by

Therefore the number of combinations of four objects take 2 at a time is given by: