Question

A bag contains 5 red balls 4 green balls and 3 black balls.Find probability of drwaing exactly 2 red balls

Answer 1

Answer:

There are all together (5+4+3) = 12 balls in the bag ; out of it 3 balls can be selected in C(12,3) ways ; I.e.220/ways

Step-by-step explanation:

There are all together (5+4+3) = 12 balls in the bag ; out of it 3 balls can be selected in C(12,3) ways ; I.e.220/ways

now out of these 3 balls choosen in each trial 2 balls should be exactly red;

they are { rbr,rrb;brr;rgr;grr;rrg} I.e. 6 possible ways out of 220

so the reqd probability

6/220= 3/110

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Answer 2

Answer:

red balls = 5

green balls = 4

black balls = 3

total no.of balls = 5+4+3 = 12

P(drawing exactly 2 red balls ) = 2/12 =1/6

=0.16

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