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Let's practice 30 mcqs on
Probability
mcqs by everyone
The probability of occurance of two two events A and B are 1/4 and 1/2respectively.
The probability of their simultaneous occurrance is 7/50. Find the probability that neither A nor B occurs
39/100
61/100
17/100
25/99
Let A, B, C be three equally likely anb collectively exhaustiveevents.
if the odds 8 : 3 against A, 5 : 2 against B, then the odds against C are
20 : 17
43 : 34
50 : 31
77 : 34
An experiment can result in only 3 mutually exclusive events A, B and
C. If P
(A) = 2P
(B) = 3P
(C), then P
(A) =
9/11
6/11
5/11
NONE OF THESE
Two cards are drawn successively with replacement from a will shuffled deck of 52 cards, the probability that both of these will be aces, is
1/169
1/201
4/663
1/2652
In a party there are 5couples.
Out of them 5 people are chosen atrandom.
Find the probability that there are at the least two couples
5/21
5/14
16/21
1/3
9/14
Three identical dice arerolled.
The probability that the same number will appear on each of them, is
3/28
1/36
1/6
1/18
Six boys and six girls sit in a row atrandom.
The probability that boys and girls sit alternately, is
NONE OF THESE
1/231
1/154
1/462
The probability that A speaks truth is 3/5 and that of B speaking truth is 4/7. What is the probability that they agree in stating the same fact
12/35
19/35
17/35
NONE OF THESE
18/35
A fair coin is tossedrepeatedly.
If tail appears on first four tosses, then the probability of head appearing on fifth toss equals
1/32
1/5
31/32
1/2
I forgot the last digit of a 7-digit telephonenumber.
If 1 randomly dial the final 3 digits after correctly dialing the first four, then what is the chance of dialing the correct number
4/1000
1/1000
1/999
1/1001
Two dice are thrown, the ptobability that the sum of the points on the dice is 7, is
6/36
8/36
5/36
7/36
A coin is tossed 5times.
What is the probability that head appears an odd number of times
1
2/3
1/3
1/2
Three unbiased coins aretossed.
What is the probability of getting at least 2 heads
1/4
3/4
1/3
1/2
What are the chances that no two boys are sitting together for a photograph if there are 5 girls and 2 boys
1/21
2/7
4/7
5/7
Two dice are rolledsimultaneously.
Find the probability of getting the sum of numbers on the on the two faces divisible by 3 or 4
5/9
6/13
7/11
3/7
A and B are two independentevents.
The probability that both A and B occur is 1/6 and the probability that neither of them occurs is 1/3. Then, the probability of the two events are respectively
1/2, 1/6
2/3, 1/4
1/5, 1/6
1/2, 1/3
A bag contains 21coins.
It is known that 10 of these have a head on both sides whereas the remaining 11 coins arefair.
A coin is picked up at random from the bag andtossed.
The probability that the toss results in a head is
31/42
13/42
NONE OF THESE
7/42
In a lottery, there are 10 prizes and 25blanks.
A lottery is drawn atrandom.
What is the probability of getting a prize
1/7
3/7
2/5
2/7
A box contains 5 detective and 15 non-detectivebulbs.
Two bulbs are chosen atrandom.
Find the probability that both the bulbs are non-defective
NONE OF THESE
3/20
5/19
21/38
If a card is drawn from a well shuffled pack of cards, the probability of drawing a spade or a king is -
19/52
17/52
5/13
9/26
4/13
What is the probability that a leap year selected at random, will contain 53 sundays
1/3
2/7
1/7
4/7
A bag contains 5 red smileys, 6 yellow smileys and 3 greensmileys.
If two smileys are picked at random, what is the probability that both are red or both are green in colour
7
3/7
1/7
What is the probability of getting 53 Mondays in a leap year
1
1/7
2/7
3/7
Two cards are drawn at random from a well - shuffled pack of 52cards.
what is the probability that either both are red or both are queens
55/221
33/221
17/112
55/121
A letter is takenout at random from 'ASSISTANT' and another is taken out from 'STATISTICS'. The probability that they are the same letter is
19/90
35/96
NONE OF THESE
19/96
If a number is chosen at random from the set {1, 2, 3, ...., 100}, then the probability that the chosen number is a perfect cube is -
1/25
1/2
1/10
9/13
4/13
The least number of times a fair coin must be tossed so that the probability of getting at least one head is at least 0.8 is
7
5
NONE OF THESE
6
A man has 10 coins each of 10 paisedenomination.
One of the coins is known to have twoheads.
He takes out one coin at random and tosses it 5times.
If it always falls with head upwards, the probability that it is the double-headed coin, is
32/41
1/10
9/32
NONE OF THESE
Two dice are rolledsimultaneously.
Find the probability of getting a total of 9
1/3
8/9
9/10
1/9
The probabilities that a student will receive an A, B, C or D grade are 0.4, 0.3 , 0.2 and 0.1respectively.
Find the probability that a student will receive Atleast B grade
0.21
0.3
0.7
NONE OF THESE
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