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Learning Task 2
Read the problem then solve.
1. A box contains 3 red marbles, 3 green marbles and 24 yellow marbles. What is the probability of
getting a green marble?
2. Your brother put 2 red eggs, 1 boiled egg and dozens of white eggs in a basket. What is the chance
that when you get an egg from the basket, you will pick a red egg?​


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%

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