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Numerical Ability
Probability
From a pack of 52 cards, two are drawn at random.Find the chance that one is a knave and the other a queen.
(1). 8/663 (2) 1/6 (3) 1/9 (d) 1/12
Read Solution (Total 4)
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- (1) 8/663
Let 'S' be the sample space, selecting 2 cards out of 52, n(S)=52C2=52*51/(2*1)=1326 and
let 'E' be the event getting one knave(jack) and one queen, then
n(E)=4C1*4C1=4*4=16
So probability=n(E)/n(S)=16/1326= 8/663
- 8 years agoHelpfull: Yes(33) No(0)
- 4/52 *4/51 + 4/52* 4/51 = 8/663
- 7 years agoHelpfull: Yes(1) No(0)
- No. of Knave = 4
No. of Queen = 4
therefore probability = (4C1 * 4C1)/52C2 - 7 years agoHelpfull: Yes(1) No(0)
- 4c1*4c1/52c2=8/63
- 7 years agoHelpfull: Yes(0) No(0)
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