I have taken coaching from NARESH INSTITUTE for CRT (Campus Recruitment Training). In these videos, I have explained all the questions with answer and how to approach for the question etc, in the same manner how they have taught to me at the time of training. Hope u like it.
Aptitude training playlist link :
https://www.youtube.com/playlist?list=PL3v9ipJOEEPfumKHa02HWjCfPvGQiPZiG
For full playlist of Interview puzzles videos :
https://www.youtube.com/playlist?list=PL3v9ipJOEEPfI4zt4ExamGJwndkvg0SFc
24 standard interview puzzles:
https://www.youtube.com/playlist?list=PL3v9ipJOEEPefIF4nscYOobim1iRBJTjw
for C and C++ questions, that are asked in the interviews, go through the posts in the link : http://comsciguide.blogspot.com/
for more videos, my youtube channel :
https://www.youtube.com/channel/UCvMy2V7gYW7VR2WgyvLj3-A
2. • Favorable events + Unfavorable events = Total number of
Events
• Probability of event =
• Maximum value of Favorable Events = Total events =
max(P(E))= 1
• Minimum value of Favorable Events = min(P(E)) = 0
• 0 < P(E) < 1
Basics :
3. 1. From a set of 1st 20 natural numbers, if one number is selected at a time,
what is the probability that it is a multiple of 3 or 5?
2. When 2 dice are rolled at a time, what is the probability that sum of the
numbers on the dice is at least 10?
3. When 5 unbiased coins are tossed, what is the probability that they get
exactly 3 heads?
4. From a pack of 52 cards, if one card is selected at a time, what is the
probability that it is a diamond or a face card?
5. What is the probability that a non leap year has 53 Monday’s?
6. A bag contains 3 red, 4 blue and 5 green colored balls. If 2 balls are
selected at a time, what is the probability that both the balls are of
different colors?
4. 1. From a set of 1st 20 natural numbers, if one number is selected
at a time, what is the probability that it is a multiple of 3 or 5?
Ans :
divisible by 3 are 3,6,….18 => 6 numbers
divisible by 5 are 5,10,….20 => 4 numbers
15 is common for both .
Total number of favorable events are 10 – 1= 9
Total number of events are 20
Probability that it is multiple of 3 or 5 = .
Probability that it is multiple of 3 or 5 =
5. When 2 dice are rolled at a time, what is the probability that sum of the
numbers on the dice is at least 10?
2.
NOTE :
When n dice are rolled at a time, then total number of events is given by
For the sum to be 10, then pair should be (4,6) (5,5)
Total number of favorable events are 2
Total number of events are 36
Probability that the sum is 10 =
Ans :
Probability that the sum is 10
6. When 5 unbiased coins are tossed, what is the probability that they
get exactly 3 heads?
3.
Ans :
NOTE :
When ‘n’ biased coins are tossed at a time, then total number of events is given by
To get exactly 3 heads, the pairs should be HHHTT i.e. taking 3 coins with heads
Total number of favorable events are
Total number of events are
Probability to get exactly 3 heads =
Probability to get exactly 3 heads =
7. 52
26 BLACK 26 WHITE
13 SPADES 13 HEART13 CLUBS 13 DIAMOND
A,1…..Q,K A,1…..Q,K A,1…..Q,K A,1…..Q,K
8. From a pack of 52 cards, if one card is selected at a time,
what is the probability that 1) it is a red card?
2) it is a spade
3) it is a Ace
4) it is a diamond king
5) it is a face card
6) it is a king or queen
7) it is a queen or heart
4.
9. 1. probability that it is a red card =
2. probability that it is a Spade =
3. probability that it is a red card =
4. probability that it is a red card =
5. probability that it is a red card = =
6. probability that it is a red card = =
7. probability that it is a red card = =
Ans :
10. What is the probability that a non leap year has 53 Monday’s?5.
Ans :
365 days = 52 weeks + 1 day
That extra one day can be Monday or Tuesday …. Or Sunday.
=> Considering the case of 52 Monday’s + the extra one day should be
Monday
probability that a non leap year has 53 Monday’s =
Probability that a non leap year has 53 Monday’s =
11. A bag contains 3 red, 4 blue and 5 green colored balls. If 2 balls are
selected at a time, what is the probability that both the balls are of
different colors?
6.
Ans :
Probability that both balls are of different colors =
3 – R , 4 – B , 5 – G
Probability that both balls are of different colors =
=
14. 1. From a set of 1st 10 natural numbers, if 2 numbers are selected at a
time, what is the probability that the sum is 10?
2. From a set of 1st 40 natural numbers, if one number is selected at a
time, what is the probability that it is a multiple of 7?
3. What is the probability that a non leap year has 52 Monday’s?
4. From a pack of 52 cards, if one card is selected at a time, what is
the probability that it is a diamond or a face card(J,K,Q)?
15. 1. From a set of 1st 10 natural numbers, if 2 numbers are selected
at a time, what is the probability that the sum is 10?
Ans :
Numbers that sum is 10 are (1,9) (2,8) (3,7) (4,6)
Total number of favorable events are 4
Total number of events are 45
Probability that sum is 10 =
Probability that sum is 10 =
16. From a set of 1st 40 natural numbers, if one number is selected at a
time, what is the probability that it is a multiple of 7?
Ans :
7,14,21,28,35,42
Total number of favorable events are 5
Total number of events are 40
Probability that it is multiple of 7 = .
Probability that it is multiple of 7 =
2.
17. What is the probability that a non leap year has 52 Monday’s?3.
Ans :
365 days = 52 weeks + 1 day
That extra one day can be Monday or Tuesday …. Or Sunday.
=> Considering the case of 52 Monday’s + the extra one day should be
Monday
probability that a non leap year has 52 Monday’s =
Probability that a non leap year has 53 Monday’s =
18. From a pack of 52 cards, if one card is selected at a time, what is the
probability that it is a diamond or a face card(J,K,Q)?
4.
Ans :
Total number of favorable events are
13 + 12 =25
Total number of events are 52
probability that it is a diamond or a face card = .
Probability that it is a diamond or a face card = .