Latest TCS Aptitude Question SOLUTION: there are 7 people in a room then wat is d probability dat 2 of dem hv same birthdy?

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there are 7 people in a room then wat is d probability dat 2 of dem hv same birthdy?

Asked In TCS akanksha (10 years ago)

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suvam  (10 years ago)

365*365*364*363*362*361*360/(365)^7

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

Guru Pranav  (10 years ago)

365*365*364*363*362*361*360/(365)^7= 0.02

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

Ajay Poshak  (10 years ago)

Total people = 7
People having same birthday = 2
So the probability is 2/7 (Favorable events / Total possible events).

Is this solution Helpfull? Yes (2) | No (5)  

ira upadhyay  (10 years ago)

365*365*364*363*362*361*360/365^7

Is this solution Helpfull? Yes (2) | No   

Anupam Mondal  (10 years ago)

7c2*365*364*363*362*361*360/(365)^7

Is this solution Helpfull? Yes (2) | No   

pravas patra  (10 years ago)

out of 7 2 people can be chosed in 7c2=7*6/2
and d prob. of same brdy is (1/7)^2*7*6/2=6/14

Is this solution Helpfull? Yes (1) | No (3)  

priyanka  (10 years ago)

can u pls elaborate it?

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

MAHASIN RAHAMAN  (10 years ago)

selecting two peoples from thr grp of 7 is,, 7c2 ...(1)
now, selecting a common day for those two guy's bday is 7c1.. (2)
and the other 5 peoples chooses the remaining 5 days out of 6 days in,, 6c5*5!. (3)
now, number of ways 7 peoples can be born on 7 days in 7^7
hence answer will be,,, {(1)*(2)*(3)}/7^7
== (7c1*7c2*6c5*5!)/7^7

Is this solution Helpfull? Yes (1) | No (3)  

Final year  (10 years ago)

pls explain

Is this solution Helpfull? Yes | No (1)  

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