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 English interview questions  English Interview Questions (454)
 General Aptitude interview questions  General Aptitude Interview Questions (1887)
 Puzzles interview questions  Puzzles Interview Questions (460)
Question
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 ?
 Question Submitted By :: Jeba
I also faced this Question!!     Rank Answer Posted By  
 
  Re: 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 ?
Answer
# 1
30 minutes 
Is This Answer Correct ?    5 Yes 55 No
Sameer
 
  Re: 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 ?
Answer
# 2
45 minutes.
increases by 2 after every 5 minutes.
 
Is This Answer Correct ?    16 Yes 30 No
Jackass
 
 
 
  Re: 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 ?
Answer
# 3
47.5 
Is This Answer Correct ?    79 Yes 9 No
Sourav
 
  Re: 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 ?
Answer
# 4
1->2->4->8....by 10 minutes it will reach 1024 persons. so
it will take 10 minutes to 768 persons
 
Is This Answer Correct ?    2 Yes 41 No
Jayanthi
 
  Re: 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 ?
Answer
# 5
5 min-2
10-4
15-8
20-16
25-32
30-64
35-128
40-256
45-512
47.5-768

r u clear friends..
 
Is This Answer Correct ?    186 Yes 11 No
Harry
 
  Re: 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 ?
Answer
# 6
no way,wat a que?
nice ques
Ans is 47.5.Its sure.
 
Is This Answer Correct ?    23 Yes 6 No
Rajez
 
  Re: 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 ?
Answer
# 7
i don't understand, why are you ppl not counting the ppl who
have been told the secret before

5 min-2
10-4, total so far=6
15-8, total so far=14
20-16, tsf=30
25-32, tsf=62
30-64, tsf=126
35-128, tsf=254
40-256, tsf=510
45-512, tsf=1022
---------------
50-1024, tsf=xyz

clearly ans should lie between 40 & 45...the options
definitely do not include the correct one!

you can also solve it by using binary tree + GP + log and
find the ans to be around 43
 
Is This Answer Correct ?    11 Yes 11 No
Crazyfantaxy
 
  Re: 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 ?
Answer
# 8
47.5mins 
Is This Answer Correct ?    10 Yes 8 No
Guest
 
  Re: 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 ?
Answer
# 9
47.5 mins
because 2^9=512
& 2^10=1024 but
total no. of persons=768
i.e 512+256(or 2^8)
so for 9th iteration it is 9*5=45mins
but after that only half persons(512/2=256) are to be
informed which will take 2.5mins(5/2). so
the final answer will be 45+2.5=47.5 mins....
 
Is This Answer Correct ?    29 Yes 7 No
Jyoti Chandra Azad
 
  Re: 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 ?
Answer
# 10
ans: 45 min



thank you
 
Is This Answer Correct ?    3 Yes 12 No
Srinu M
 

 
 
 
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