Twelve flowers

A florist has roses, tulips, daffodils, and carnations to use in flower arrangements. If she were to make an arrangement using 12 flowers, how many different combinations of these 4 types of flowers would be possible?

Correct result:

x =  455

Solution:

C12(15)=(1512)=15!12!(1512)!=151413321=455 n=4 k=12  x=(n+k1k)=(4+12112)=455



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