Latest CTS Aptitude Question SOLUTION: varun is guessing which of the 2 hands holds a coin. what is the probability that varun guesses correctly three times in a row? a. 1/6 b. 1/2 c. 1/4 d. 1/8

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(#M40147196) CTS Numerical Ability question Keep an EYE

varun is guessing which of the 2 hands holds a coin. what is the probability that varun guesses correctly three times in a row?
a. 1/6 b. 1/2 c. 1/4 d. 1/8

Asked In CTS mousumi mukherjee (9 years ago)

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PINAKI RATH  (9 years ago)

Ans will be 1/8. as there are 2 hands to hide the coin and it can be in 1 of them. so the prob of guessing or the coin be in either of 1 hand is 1/2.[here 1(i.e. 1 hand) is the outcome & 2(i.e. both or 2 hands) is the possible outcomes, prob= outcome/possible outcomes].Now 3 times in a row i.e. the same work is being performed 3 times to perform the whole task given in qstn. So, (1/2)(1/2)(1/2)=1/8

Is this solution Helpfull? Yes (35) | No   

Anand Dwivedi  (9 years ago)

2 Coin= prob is 4

And Men=1

So according to formula = 1/4


1/4 is Correct Answer

Is this solution Helpfull? Yes (4) | No (15)  

aman  (9 years ago)

Prob will be 1/2
Option b

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

Parise Pavan  (5 years ago)

Probability of coin tossing is =1/2
No.of.times=3
Probability of tossing a coin 3 times = 1/2*1/2*1/2
= 1/8

Is this solution Helpfull? Yes (3) | No   

mousumi mukherjee  (9 years ago)

explain @aman

Is this solution Helpfull? Yes (2) | No   

Bharath Vikkurthi  (6 years ago)

Do it as smart way
P = n(E)/n(S)
Tossing a coin 3 times so total no.of outcumes is 8
Varun guess possibility is 1
1/8

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

mousumi mukherjee  (9 years ago)

@anand there is only one coin not two.pls check your solution

Is this solution Helpfull? Yes (1) | No   

Prashant Kumar  (8 years ago)

d.1 /8 because we have to attempt three times hence there will be 8 sample space from which we have to find( RRR) such as three coins ar etossed and have to probability of (HHH).

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

abhishek  (6 years ago)

c. 2C1/8=1/4

Is this solution Helpfull? Yes | No (1)  

keerthana  (5 years ago)

1/4
4c3=1/4

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