Latest Gate Aptitude Question SOLUTION: a gambler has 4 coins in her pocket. two are double headed one is doubled tailed and one is normal.the coins can not be distinguished unless one looks at them. the gambler takes a

• Placement Papers
• /
• Gate
• /
• General Ability

Gate Question Papers:

(#M40154125) GATE General Ability question probablity Keep an EYE

a gambler has 4 coins in her pocket. two are double headed one is doubled tailed and one is normal.the coins can not be distinguished unless one looks at them.
the gambler takes a coin at random,opens her eyes and sees the the upped face of the coin is a head .what is the probability that the lower face is a head?

Asked In Gate mansi tyagi (8 years ago)

Unsolved Read Solution (1)

Is this Puzzle helpful?   (3)   (2) Submit Your Solution

Read Solution (1) :

Sanjoy Debnath  (8 years ago)

It's a conditional probability question

Let's solve it by most simple method. The coins are of type { HH, HH, TT, HT}

so, there are 5 ways of getting head (i.e. H? or ?H) = P(H)
upon them only in 4 cases head appears in the opposite phase.
so, the probability would be = 4/5 = 0.8

Is this solution Helpfull? Yes (1) | No   

Please Login to Read Solution.