A bag contains Five blue marbles, 6 red ones and 9 green ones. Two marbles are drawn at random, one at a time, without replacing. What is the probability of selecting two blue marbles?

a 9/20
b 3/38
c 1/19
d 11/20

Question

05-10-2016
Mathematics

contestada

A bag contains Five blue marbles, 6 red ones and 9 green ones. Two marbles are drawn at random, one at a time, without replacing. What is the probability of selecting two blue marbles?

a 9/20
b 3/38
c 1/19
d 11/20

Respuesta :

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AL2006 AL2006 · Answer 1 · 2016-10-05T18:23:07+02:00

There are 20 marbles all together in the bag.
5 of them are blue.

The probability of pulling a blue one on the first draw is

   5 / 20 .

After that, there are 19 marbles left in the bag, and 4 of them are blue.
The probability of pulling a blue marble on the second draw is

   4 / 19 .

The probability of both draws being blue is

   (5/20) x (4/19)

   = 1 / 19 = 5.26...% (rounded)

A bag contains Five blue marbles, 6 red ones and 9 green ones. Two marbles are drawn at random, one at a time, without replacing. What is the probability of selecting two blue marbles? a 9/20 b 3/38 c 1/19 d 11/20

Respuesta :

Otras preguntas

A bag contains Five blue marbles, 6 red ones and 9 green ones. Two marbles are drawn at random, one at a time, without replacing. What is the probability of selecting two blue marbles?

a 9/20
b 3/38
c 1/19
d 11/20