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 General Aptitude
 Probability
6.
What is the probability of getting not more than 7 in rolling of a die?

A.
1 2_{} 
C.
1_{} 3_{}

B.
1_{} 4_{}  D.1
 Answer & Explanation
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Answer : [D]
Explanation :
Explanation :


Let A be the event of getting a number not more than 7  




7.
One card is drawn from a pack of 52 cards, each of the 52 cards being equality likely to be drawn. Find the probability that the drawn card is either red or king

A.
1 26 
C.
1 52

B.
1 2 
D.
7 13
 Answer & Explanation
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Answer : [D]
Explanation :
Explanation :
Out of 52 cards one card can be drawn in 52C_{1} ways  
Total no. of elementary events = 52C_{1} = 52  


which are either red or king. Out of this 1 card can be drawn in 28 C_{1} ways  




8.
Akhilesh and Jaga are friends. What is the probability that both have different birthdays (ignoring a leap year)

A.
2 5_{} 
C.
364_{} 365_{}

B.
1_{} 2_{}  D.1
 Answer & Explanation
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Answer : [C]
Explanation :
Explanation :
If Akhilesh’s birthday is different from jaga’s, the number of favorable outcomes for birthday is 365 – 1 = 364 



9.
A bag contains 6 White balls and 4 black balls. Four balls are successively drawn without replacement. What is the probability that they are alternatively of different colours?

A.
5 9_{} 
C.
5_{} 7_{}

B.
1_{} 7_{} 
D.
3_{} 7_{}
 Answer & Explanation
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Answer : [B]
Explanation :
Explanation :
The first ball drawn may be either white of black  
Suppose the ball drawn in the order white, black, white, black.  


Suppose the ball drawn are in the order black, white, black, white.  




10.
Four cards are drawn at random from a pack of 52 playing cards, Find the probability of getting all face cards.

A.
12C_{4} 52C_{4} 
C.
11C_{4} 52C_{4}

B.
13C_{4} 52C_{4} 
D.
10C_{4} 52C_{4}
 Answer & Explanation
 Report
Answer : [A]
Explanation :
Explanation :
Four Cards can be drawn from a pack of 52 cards in 52C_{4} ways  


There are 12 face cards (4 kings, 4 Queens and 4 jacks) out of these 12 face cards, 4 cards can be selected in 12C_{4} ways  



