Latest TCS Aptitude Question SOLUTION: A father purchase dresses for his three daughters.The dresses are of same color but of different size. The dress is kept in dark room.What is the probability that all the three wil

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A father purchase dresses for his three daughters.The dresses are of same color but of different size. The dress is kept in dark room.What is the probability that all the three will not choose their own dress.

Asked In TCS purva (9 years ago)

Solved NIVEDA SIVAPRAKASAM Read Solution (11)

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NIVEDA SIVAPRAKASAM  (9 years ago) Best Solution

Ans is 1/3.
For he first girl: probability for not selecting correct dress is 2/3
for the second girl: it is 1/2
for the third girl: it is 1
2/3*1/2*1=1/3

Is this solution Helpfull? Yes (46) | No (4)  

sunny kumar  (9 years ago)

ans= 1/3
d1 d2 d3-- dress
g1 g2 g3 -- girls
for girl g1 probality of selecting wrong dress= 2/3
here one dress is picked so only 2 are remainning...
for girl g2= 1/2
now, only one dress is remainning
for g3 = 1
1*1/2*2/3= 1/3

Is this solution Helpfull? Yes (8) | No   

arjit  (9 years ago)

there are 3 dresses total combinations which are favourable is 3!=6

now dresses are first,second ,third
girls are 1 2 3

now 1st- third ,2-first,3-second or 1st-second 2nd-third 3 first

only6 2 conditions are there so 2/6 =1/3

Is this solution Helpfull? Yes (3) | No   

Mohit  (9 years ago)

let assume first girl select his dress so his probability is 1/3 and for not selecting correct dress probability is 1-(1/3)=2/3
second girl select his correct dress so his probability is 1/2 and for not selecting correct dress probabilty is 1-(1/2)=1/2
And the last girl has only one choice so his probability is 1
Total Probability is = (2/3)*(1/2)*(1)=1/3

Is this solution Helpfull? Yes (3) | No   

SUMAN GHOSH  (9 years ago)

3 dresses are there.
everyone can choose wrong dress 2 ways
probability of choosing wrong dress on each case is 2/3
total probability = 2/3 * 2/3 * 2/3 = 8/27

Is this solution Helpfull? Yes (2) | No (11)  

SHUBHAM MAHESHWARI  (9 years ago)

1/3

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

Satyaki Bhattacharjee  (9 years ago)

Two chooses wrongly,
(1/3*2*/3*2/3)*3=4/9
three chooses wrongly,
(2/3*2/3*2/3)=8/27
Total probability = 4/9 + 8/27 =20/27

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

Gopal Naskar  (9 years ago)

ans is 1/3
for the first girl there have 1 correct and 2 is not her own so probablity for not selecting correct is 2/3
for 2nd girl is 1/2
for 3rd girl is 1
2/3*1/2*1=1/3

Is this solution Helpfull? Yes (1) | No   

Surit Datta  (9 years ago)

2/3 * 1/2 * 1 = 1/3 is the probability.

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

Saddam Mondal  (9 years ago)

ans : 1/3

Is this solution Helpfull? Yes | No (4)  

B.sudarsana kapoor  (6 years ago)

3 daughters
first daughter select a dress = 1/3* 2/3
secound daughter select a dress = 1/3*2/3
third daughter select a dress= 1/3*2/3
total = 6/9=2/3
now three will not choose their own dress
1-2/3
1/3

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