Sagot :
Answer:
1.3/30=1/10
2.2/15
Step-by-step explanation:
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Lets consider just one color say red first
Probability of drawing one red marble= 3/10
Probability of drawing two red marbles= 3/10 * 2/9
Probability of drawing three red marbles= 3/10 * 2/9 * 1/8
So the formula is
r/n *(r-1/n-1)* (r-2/n-2) where r is number of red marbles and n is total number of marbles
For marbles to be of same color, they can be of any of the three colors
so
=(3/10 * 2/9 * 1/8) + (4/10 * 3/9 * 2/8)+ (3/10 * 2/9 * 1/8)
=(6+24+6)/720
=36/720
= 0.05 or 5%
