Latest IBPS Aptitude Question SOLUTION: A bag contains 4 red, 5 green and 7 blue balls. Two balls are drawn at random. What is the probability that one is green and second of the balls drawn is blue? (1)10/11 (2)11/21 (3

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(#M40154061) IBPS Numerical Ability question quants Keep an EYE

A bag contains 4 red, 5 green and 7 blue balls. Two
balls are drawn at random. What is the probability
that one is green and second of the balls drawn is
blue?
(1)10/11 (2)11/21 (3)35/128
(4)5/76 (5)None of these

Asked In IBPS Sarabeshwar (8 years ago)

Unsolved Read Solution (4)

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Read Solution (4) :

ranjeet kumar  (8 years ago)

total outcomes = 16c2.
probability of 1 ball is green and 2nd ball is blue is=5c1*7c1/16c2=5*7/8*15=7/24
so ans is (5)none of these

Is this solution Helpfull? Yes (8) | No   

MEET  (8 years ago)

3). (4c1*7c1)/(16c2) = 35/128

Is this solution Helpfull? Yes (2) | No (8)  

aditi kumari  (8 years ago)

(5).
probability of one ball green and second ball blue is (4c1/16C1)*(7c1/15C1).

Is this solution Helpfull? Yes | No (5)  

meenakshi kharate  (8 years ago)

Total 2 balls are drawn so its probability is 16C2 ( 16 because there are total 16 balls)

Now probability that 1st one is green is 5C1 ( as it is asked for 1st ball to be green we will choose only from green balls)

and 2nd ball to be blue probability is 7C1( as 7 blue balls r there)
now total probability will be (5C1+7C1)/16C2

=> 12/120
=>1/10
so reqiured ans must be 1/10

Is this solution Helpfull? Yes | No (5)  

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