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In a class, there are 15 boys and 10 girls. Three students are selected at random. The probability that 1 girl and 2 boys are selected, is:
A21/46
B25/117
CJan-50
D25-Mar
ENone of these
Answer: Option A
Explanation:Let's assume the sample space = S
and Event of selecting 1 girl and 2 boys = E
So, n(S) = Number ways of selecting 3 students out of 25 = 25C3
=> (25 * 24 * 23)/(3 * 2 * 1) = 2300.
n(E) = (10C1 * 15C2)
= 10 * [(15 * 14)/(2 * 1)] = 1050.
P(E) = n(E)/n(S) = 1050/2300 = 21/46.
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A bag contains 2 red, 3 green and 2 blue balls. Two balls are drawn at random. What is the probability that none of the balls drawn is blue?
A10/21
B11/21
C2/7
D5/7
Answer: Option A
Explanation:Answer: 10/21
Solution: 2 red, 3 green, and 2 blue balls are there. So the probability of getting no blue ball is not selecting any blue ball among the two chosen balls hence 5C2.
5C2/7C2 = 10/21.
7C2 because we can select any 2 balls from 7 balls in that number of ways.
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10 men and 10 women are there, they dance with each other, is there possibility that 2 men are dancing with same women and vice versa.
A1
B1/2
C2/3
DNever
ENone of these
Answer: Option D
Explanation:Answer: Never
Solution: Because it is written that 10 men and 10 women dance with each other. So there is no chance of matching more than 2 partners at a time. So 2 men
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There is a toy train that can make 10 musical sounds. It makes 2 musical sounds after being defective. What is the probability that same musical sound would be produced 5 times consecutively?
A1/32
B11/32
C1/16
D11/16
Answer: Option A
Explanation:1/2 * 1/2 * 1/2 * 1/2 * 1/2 = 1/32
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There are 11 boys in a family. Youngest child is a boy. Probability is 1 that of all are boys out of?
A2
B2!
C2048
D1024
Answer: Option D
Explanation:2 power 10=1024;
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For the FIFA world cup, Paul the octopus has been predicting the winner of each match with amazing success. It is rumored that in a match between 2 teams A and B, Paul picks A with the same probability as A's chances of winning. Let's assume such rumors to be true and that in a match between Ghana and Bolivia, Ghana the stronger team has a probability of 2/3 of winning the game. What is the probability that Paul will correctly pick the winner of the Ghana-Bolivia game?
A1/9
B4/9
C5/9
D2/3
Answer: Option C
Explanation:Answer: 5/9
Solution: Answer is 5/9 because for example
Let Paul picks Ghana then probability that its prophecy will be true is 2/3*2/3 =4/9.
Now it may pick up Bolivia and the chances of winning are 1/3*1/3=1/9
So total probability will be 4/9 1/9=5/9
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After the typist writes 12 letters and addresses 12 envelopes, she inserts the letters randomly into the envelopes (1 letter per envelope). What is the probability that exactly 1 letter is inserted in an improper envelope?
A1/12
B0
C12/212
D11/12
Answer: Option B
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In a lottery, there are 10 prizes and 25 blanks. A lottery is drawn at random. What is the probability of getting a prize?
A1/10
B2/5
C2/7
D5/7
Answer: Option C
Explanation:P (getting a prize) = 10/(10 + 25)
=> 10/35 = 2/7
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A 5-digit number is formed by the digits 2,4,5,6,8 (each digit used exactly once) . What is the probability that the number formed is divisible by 4 ?
A1/5
B2
C3
D2/5
Answer: Option D
Explanation:A no. is divisible by 4 if last two digit is divisible by 4
so numbers ending with 24,28,48,52,56,64,68,84 are divisible by 4
last two places are fixed by 24,28,48,52,56,64,68,84
so remaining 3 places can be filled in 3! ways for each
total=8*3!=48=n(E)
n(S) = 5!
so
= n(E)/n(S)
=48/120=2/5
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A group consists of equal number of men and women. Of them 10% of men and 45% of women are unemployed. If a person is randomly selected from the group. Find the probability for the selected person to be an employee.
A15/40
B30/40
C29/40
D19/40
Answer: Option C
Explanation:Lets assume men=100, women=100 then employed men & women = (100-10)+(100-45) = 145
So probability for the selected person to be an employee = (145/200) = 29/40
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