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Numerical Ability
Probability
There are two boxes, one containing 21 red balls and the other containing 25 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 is maximized. This maximum probability is
(a) 0.5 (b) 0.63 (c) 0.72 (d) 0.48
Read Solution (Total 3)
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- 1/2*(1+20/45)=65/90=.72
- 13 years agoHelpfull: Yes(15) No(1)
- 0.72
we will keep 1 red ball in 1 box and rest 20 in another box.
then total prob.=
1/2 +1/2*2/9=13/18 - 13 years agoHelpfull: Yes(11) No(10)
- .72 option c is correct
- 6 years agoHelpfull: Yes(0) No(0)
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