contestada

HELP ME PLEASE!!!
A bag contains 10 marbles: 2 are green, 6 are red, and 2 are blue. Jenny chooses a marble at random, and without putting it back, chooses another one at
random. What is the probability that both marbles she chooses are green? Write your answer as a fraction in simplest form.

Respuesta :

1/45 had this same question on a graded test
mhanifa

Answer:

  • 1/45

-----------------------

Total number of marbles is 10 and 2 out of them are green.

The probability of a green at first choice is:

  • P(green) = 2/10 = 1/5

Since no replacement, at second choice we have 9 total and 1 green:

The probability of second green is:

  • P(green) = 1/9

The probability of two greens is :

  • P(2 greens) = 1/5 * 1/9 = 1/45