## Probability Quiz-12

Probability is an important topic in JEE advanced examination. In this exam, probability carries weightage of 7% of questions. With focused practice good marks can be fetched from this topic .

Q1. A car is parked among N cars standing in a row, but not at either end. On his return, the owner finds that exactly ‘r’ of the N palces are still occupied. The probability that the places neighouring his car are empty is:
•  (r-1)!/(N-1)!
•  (r-1)!(N-r)!/(N-1)!
•  ((N-r)(N-r-1))/((N+1)(N+2))
•  N-rc2/N-1c2
Solution

Q2. If three square are selected at random from chessboard, then the probability that they form the letter ‘L’ is:
•  196/64c3
•  49/64c3
•  36/64c3
•  98/64c3
Solution

Q3.  Three houses are available in a locality. Three persons apply for the houses. Each applies for one houses without consulting others. The probability that all three apply for the same houses is:
•  1/9
•  2/9
•  7/9
•  8/9
Solution

Q4. One ticket is selected at random from 100 tickets numbered 00, 01, 02, …, 99. Suppose A and B are the sum and product of the digit found on the ticket. Then P((A=7)/(B=0)) is given by:
•  2/13
•  2/19
•  1/50
•  None of these
Solution

Q5. A doctor is called to see a sick child. The doctor knows (prior to the visit) that 90% of the sick children in that neighborhood are sick with the flu, denoted by F, while 10% are sick with the measles, denoted by M. A well-known symptom of measles is a rash, denoted by R. The probability of having a rash for a child sick with the measles is 0.95. however, occasionally children with the flu also develop a rash, with conditional children with the flu also develop a rash, with conditional probability 0.08. Upon examination the child, the doctor finds a rash. Then what is the probability that the child has the measles?
•  91/165
•  90/163
•  82/161
•  95/167
Solution

Q6. An artillery may be either at point I with probability 8/9 or at point II with probability 1/9. We have 55 shells, each of which can be fired either rat point I or II. Each shell may hit the target, independent of the other shells, with probability 1/2. Maximum number of shells must be fired at point I to have maximum probability is:
•  20
•  25
• 29
•  35
Solution

Q7. An urn contains 3 red balls and n white balls. Mr. A draws two balls together from the urn. The probability that they have the same colour is 1/2.Mr. B draws one balls form the urn, notes its colour and replaces it. He then draws a second ball from the urn and finds that both balls have the same colour is 5/8. The possible value of n is:
•  9
•  6
•  5
•  1
Solution

Q8.Let E be an event which is neither a certainty nor an impossibility. If probability is such that P(E)=1+Î»+Î»2 and P(E' )=(1+Î»)2 in terms of an unknown Î». Then P(E) is equal to:
•  1
•  3/4
•  1/4
•  None of these
Solution

Q9.There are 3 bags which are known to contain 2 white and 3 black, 4 white and 1 black, and 3 white and 7 black balls, respectively. A ball is drawn at random from one of the bags and found to be a black ball. Then the probability that it was drawn from the bag containing the most black ball is:
•  7/15
•  5/19
•  3/4
•  None of these
Solution

Q10. Thirty-two players ranked 1 to 32 are playing in a knockout tournament. Assume that in every match between any two players, the better-ranked player wins, the probability the ranked 2 players are winner and runner up, respectively, is:
•  16/31
•  1/2
•  17/31
• None of these
Solution

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