Latest TCS Aptitude Question SOLUTION: an elevator starts with 5 passengers and stops at different floors of house.find out probability of all 5 passengers alighting at different floors?

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an elevator starts with 5 passengers and stops at different floors of house.find out probability of all 5 passengers alighting at different floors?

Asked In TCS sushmita (12 years ago)

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Abhishek Malviya  (12 years ago)

when anyone can go on any floor then
1st can go to any floor in n ways.
2nd can go to any floor in n ways.
3rd can go to any floor in n ways.
4th can go to any floor in n ways.
5th can go to any floor in n ways.
so total no. of ways passenger alighting at floors = n*n*n*n*n = n^5

now when they go to different floor then :-
1st can go to any floor in n ways.
2nd can go to any floor in n-1 ways.
3rd can go to any floor in n-2 ways.
4th can go to any floor in n-3 ways.
5th can go to any floor in n-4 ways.
so probabolity required will be = n*(n-1)*(n-2)*(n-3)*(n-4)/n^5

Is this solution Helpfull? Yes (32) | No (5)  

Smita  (12 years ago)

It will depend on number of floors also which is not given.

if there are n floors, then
probability = n*(n-1)*(n-2)*(n-3)*(n-4)/n^5

Is this solution Helpfull? Yes (12) | No (1)  

Ashish Singh  (12 years ago)

Guys...plzzz send me tcs new pattern questions with solution to my mail singh.ashish4nov@gmail.com.

TCS is coming to my college on the last of this month..guys plzz help me..plzz do send

Is this solution Helpfull? Yes (6) | No (3)  

venkatesh  (12 years ago)

Guys...plzzz send me tcs new pattern questions with solution to my mail venkat3191@gmail.com.

TCS is coming to my college on 27th..guys plzz help me..plzz do send.

Is this solution Helpfull? Yes (5) | No (8)  

Subrat Baral  (12 years ago)

Guys...plzzz send me tcs new pattern questions with solution to my mail subrat.baral@rediffmail.com.

TCS is coming to my college on 27th..guys plzz help me..plzz do send.

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sushmita  (12 years ago)

plz explain formula?

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shyamlesh dash  (12 years ago)

if any body got anything pls mail me shyamleshd@gmail.com

Is this solution Helpfull? Yes | No (3)  

naina  (12 years ago)

if any one of gets paper then pls mail it to me at neelasarkar1991@gmail.com

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Vikram Singh  (10 years ago)

Number of ways to select Mathematics is = 1
Now student has to select 2 subjects out of remaining 5 subjects such that each selection includes Biology as one of the subject.
This can be done by 4 ways i.e. Biology – Hindi, Biology – Physics, Biology – English and Biology – Chemistry.
Hence, n (E) = 4
And n (S) = 5C2 = 10
Hence, the probability = 4/10=2/5

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