I think equations because you have to know how to use numbers
Answer:
-6n -(3n - 9) + 5n = -4 (2n - 8)
-6n -3n +9 +5n = -8n +32
-9n +5n +9 = -8n +32
-4n + 9 = -8n +32
8n - 4n = 32 - 9
4n = 23
n = 23/4 = 5.75
The probability is 4⋅3⋅2⋅1/10•9•8•7=(4/4)(6/0)/(10/4)=1/210 so the probability of selecting 3 red balls would be 1/210
