Latest TCS Aptitude Question SOLUTION: a drawer hold 4 red hates and 4 blue hates. what is the probability of getting exactly 3 when taking out 4 hates randomly out of the drawer and immediately returning every hate to

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(#M40155599) TCS Numerical Ability question Keep an EYE

a drawer hold 4 red hates and 4 blue hates. what is the probability of getting exactly 3 when taking out 4 hates randomly out of the drawer and immediately returning every hate to the drawer before taking out the next?

Asked In TCS priya paul (8 years ago)

Unsolved Read Solution (6)

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sushovan mallick  (8 years ago)

Sorry by mistake
for red 1/2*1/2*1/2*1/2= 1/16
for blue 1/2*1/2*1/2*1/2= 1/16
ans= 1/16+1/16=1/8

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sushovan mallick  (8 years ago)

ans= 1/8
for red 1/2+1/2+1/2+1/2= 1/16
for blue 1/2+1/2+1/2+1/2= 1/16
ans= 1/16+1/16=1/8

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Sufal Ghosh  (8 years ago)

Ans: 1/4

as n(s)=4*4=16
n(a)=4
p(a)=a/16=1/4

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lakshminarayanan  (7 years ago)

i go for C 1/2

probability of taking a particular hat is 1/2 ( 4/8)

Now assume we have 2 take 3 blues and 1 red

P(BBBR) = (1/2)^4
P(BBRB) = (1/2)^4
P(BRBB) = (1/2)^4
P(RBBB) = (1/2)^4
total = 4 * (1/2)^4

similarly with red

thus the total is 2*4*1/16 = 8/16 = 1/2

hope its clear..

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Reeti Mittal  (7 years ago)

for red-->1/4*1/4*1/4=1/64
for blue-->1/4*1/4*1/4=1/64
ans=1/64+1/64=1/32
i think this should be the ans..please correct me if i m wrong

Is this solution Helpfull? Yes | No (4)  

Reeti Mittal  (7 years ago)

For red-->4/8*4/8*4/8=1/8
for blue-->4/8*4/8*4/8=1/8
ans=1/8+1/8=1/4

Is this solution Helpfull? Yes | No (1)  

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