Latest Infosys Aptitude Question SOLUTION: there is a set of 52 card.1 card fall down.then we take 2 cards from the rest.that 2 cards are spade.what is the probablity of that fallen card is spade?

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there is a set of 52 card.1 card fall down.then we take 2 cards from the rest.that 2 cards are spade.what is the probablity of that fallen card is spade?

Asked In Infosys asxa asxaxax (10 years ago)

Solved sriram natesh Read Solution (9)

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Read Solution (9) :

Jasmine Khan  (10 years ago)

there are total 13 spades card in a pack if we have drawn 2 spade cards from the pack then out of 13 cards only 11 cards are left.
and out 52 card only 50 cards are left in hand.
p(fallen card is spade)=11C1/50C1=11/50

Is this solution Helpfull? Yes (29) | No (7)  

abhishek  (10 years ago)

beware its solution is wrong it is NCRT que and its ans is 11/50
as 2 card shown out of 52 not 51 as fallen card cant predict
so probability of card to be of spade is (13-2)/(52-2)=11/50
we simply minus here because 2 cards can firmly be predicted and thn we find rest of cards probability
it is requested to admin plz re correct the solution

Is this solution Helpfull? Yes (24) | No (1)  

sriram natesh  (10 years ago)

P=1/4
As the card fallen has nothing to do with the events which follow it...so P=13/52

Is this solution Helpfull? Yes (21) | No (19)  

sandy  (10 years ago)

the 2 cards are taken after the card is fallen.
so probability of the fallen card is a spade is 13c1/52c1=13/52=1/4

Is this solution Helpfull? Yes (7) | No (2)  

Pradeepthi  (10 years ago)

ans is 1/4
there r 52 cards
no. of sets =4. hence 52/4=13.
probability of fallen card = 13/52 =1/4

Is this solution Helpfull? Yes (4) | No (3)  

sriharsha maturu  (10 years ago)

no.of spades is 13/52

Is this solution Helpfull? Yes (3) | No (2)  

mohini gupta  (10 years ago)

probability must be(13-2)/(52-2)=11/50.
since the two drawn cards are spades. so we can't include them in finding probability.only 11 spades are left.

Is this solution Helpfull? Yes (2) | No (1)  

saurabh  (10 years ago)

admin u r wrong ans will be 11/50
as 2 cards are taken then 50 cards are remaining
also 2 spades are taken the 11 spades are remaining
so the probability of the dropped card to be spade is 11/50
(the probability is asked after the spade has been removed so only 11 spade are remaining..if it will be asked before the card are taken then the probility will be 13/52)
given in arun sharma(probability lod3 ques 1)

Is this solution Helpfull? Yes (2) | No   

AKASH SINGH  (10 years ago)

probability is = 12C2/51C2

Is this solution Helpfull? Yes (1) | No (4)  

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