Latest CTS Aptitude Question SOLUTION: A secret can be told to only 2 persons in 3 minutes. Each person in turn tells 2 other persons in the next 3 minutes and the processes continues accordingly. In 30 minutes how many

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A secret can be told to only 2 persons in 3 minutes. Each person in turn tells 2 other persons in the next 3 minutes and the processes continues accordingly. In 30 minutes how many persons can be told this secret in this way?

a) 1024 b) 2048 c) 512 d) 4096

Solution

2^1 + 2^2 + 2^3 + 2^4 + ..............+2^10 = 2(2^10 - 1)/(2-1)
= 2*1023 = 2046

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Asked In CTS (13 years ago)

Solved Read Solution (5)

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Read Solution (5) :

Vineet   (11 years ago)

2^1 + 2^2 + 2^3 + 2^4 + ..............+2^10 =>2048(b)Ans.

Is this solution Helpfull? Yes (2) | No   

kunal prasad  (11 years ago)

in 3 min 1 person say the secret to 2 people.
in 6 min (1+2=3) peroson say the secret to 6 people
in 9 min (3=6=9)person say the secret to 18 people.
see each n every time the no is multiplied by 3.(ie2 then 6 then 18)
so total no of person knw the secret in nxt 31 min=18*3^7=39366

so similarly

Is this solution Helpfull? Yes | No (1)  

sravani karanam  (10 years ago)

2^10=1024
remaining is same as manish sir solution

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Roshni  (7 years ago)

IN 3 MIN 2
IN 6 MIN 4
.
.
.IN 30 MIN 1024 (ANS)

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chandan kumar  (7 years ago)

2^1 + 2^2 + 2^3 + 2^4 + ..............+2^10 = 2(2^10 - 1)/(2-1)
= 2*1023 = 2046

Is this solution Helpfull? Yes | No   

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