Latest TCS Aptitude Question SOLUTION: There are two box,one containing 39 red balls and the other containing 26 green balls. You are allowed to move the balls between the boxes so that when you choose a box at random a

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(#M40000960) TCS Numerical Ability question Keep an EYE

There are two box,one containing 39 red balls and the other containing 26 green balls. You are allowed to move the balls between the boxes so that when you choose a box at random and a ball at random from the chosen box, the probability of getting a red ball is maximized. This maximum probability is
.60
.50
.80
.30

Asked In TCS Gaurav Chakraborty (13 years ago)

Solved Pargat Pal Singh Read Solution (4)

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Read Solution (4) :

Pargat Pal Singh  (13 years ago)

0.7968

1/2(1+38/64)

Is this solution Helpfull? Yes (44) | No (4)  

KRISHNA KANTH YENUMULA  (11 years ago)

Here we are allowed to transfer the balls between the two boxes, so we keep only one red ball in first box and move all the remaining balls to the second box, so that we get maximum probability of drawing red ball from first box
So first box--- only one red ball
second box--- 38 red and 26 green
Probability of choosing any box is 1/ 2.
probability of choosing the red ball from first box is 1
probability of choosing the red ball from second box is 38/64
So probability of taking one red ball = [(1/2)×(1)]+[(1/2)*(38/64)]≃0.8

Is this solution Helpfull? Yes (23) | No (1)  

suchandra raavi  (13 years ago)

Follow the process in puzzle #M40000963

Is this solution Helpfull? Yes (10) | No (5)  

tk  (13 years ago)

(1/2)*(1)+(1/2)*(38/64)=.6

Is this solution Helpfull? Yes (5) | No (17)  

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