The gems

The jeweler selects 4 gems for the ring. It has rubies, emeralds and sapphires. How many options does he have?

Correct answer:

x =  15

Step-by-step explanation:

C4(6)=(46)=4!(64)!6!=2165=15 n=3 k=4  x=(kn+k1)=(43+41)=15



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