Three reds

What is the probability that when choosing 3 carats from seven carats, all 3 reds will be red?

Correct result:

p =  1.6935 %

Solution:

C3(9)=(93)=9!3!(93)!=987321=84 C3(32)=(323)=32!3!(323)!=323130321=4960 p1=100 (9 8 7)/(32 31 30)=105621.6935 % p=100 (39)/(332)=10562=1.6935%



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