Interested to Buy Any Domain ? << Click Here >> for more details...
A secret can be told only 2 persons in 5 minutes .the
same person tells to 2 more persons and so on . How long
will take to tell it to 768 persons ?
- 20 Answers
- 51333 Views
- Cognizant, CTS, DCE, I also Faced
- E-Mail Answers
Answer Posted / laughing man
First in an aptitude question students are expected to keep
their eyes open to the terms used in the question. Otherwise
an aptitude paper would be the same as that of a 6th or 7th
standard question paper. The original question here was "the
same person". So the same person tells it to different
couple of people taking 5 mins each. 768 person here, so
768/2=384,384*5=1920 should have been the answer.
Now, supposing its a typical maths question, i.e. assuming
all the above assumptions made in the earlier posted answers
to be true, its a simple GP series which starts from 1, then
2 then 4 then 8 and so on.
So, by the problem,
2^0 + 2^1 + 2^2 +....+ 2^n = 768 (note: the first person has
been counted in the series)
so putting the summation formula for GP
1.(2^(n+1)-1) / (2-1) = 768
=> 2^(n+1) = 769
Now, 2^9 = 512 (leaving 257 behind)
Again, the count of 5 mins will be n number of times cause
the first term, i.e. 2^0 is the first person and he already
knows the secret, so the count will start essentially after
him. So n+1=9 => n=8. And for the remaining 257(actually
256, as the first person is counted in it) will be told in
extra 2.5 mins. So total, 8*5 + 2.5 = 42.5
| Is This Answer Correct ? | 5 Yes | 4 No |
Post New Answer View All Answers
In a class of 60 students, a student of weight 45 Kg leaves the class. The average weight of the class is then increased by 200 gms. What is the average weight of the remaining 59 students in the class?
There are some 20 Basketball players & 30 Football players, and 25 cricket players. 1 of them plays all the three games. 8 of them plays at least two games. They are 50 altogether. How many of them plays none of the games.
Each row of letters or numbers has a rule connecting them. Write the next number or letterin the brackets. 124 , 62 , 60 , 30 , 28 , 14 , (_ _ _)
in 8*8 chess board what is the total number of squares refer odel
if area is icc. by 30% then what is the change in the area?
If A=Z, B=Y, C=X, .......... Z=A, Then LIMIT = ?
A lorry starts from Banglore to Mysore at 6.00 A.M,7.00am.8.00 am.....10 pm. Similarly one another starts from Mysore to Banglore at 6.00 am,7.00 am, 8.00 am.....10.00pm. A lorry takes 9 hours to travel from Banglore to Mysore and vice versa. A lorry which has started at 6.00 am will cross how many lorries.
1. Questions on probability 2. Questions on statistics (mainly growth rates, market shares, etc.) 3. Questions on general logics 4. Evaluate strengths and weekness of proposed product All questions are open test
Three independent mechanisms A, B and C have been incorporated for power saving in a plant producing respectively 30%, 40% and 10% efficiency. Assuming that they operate independently, what is the net power efficiency achieved
a, b, b, c, c, c, d, d, d, d, . . . . . . Find the 288th letter of this series?
A finish the work in 10 days. B is 60% efficient than A. So hoW days does B take to finish the work?
Find the value of the 678 to the base 7.
A and B's temperature are 10°c and 20°c having same surface , then their ratio of rate of emmisions is ?
Integral B(Transpose)*sigma(here sigma means stress)*dV REPRESENTS?
A man drives at a speed of 40 miles/hr while his friend drives at a speed of 50 miles/hr. If the friend leaves 30 minutes after the man, when are they going to meet?
