Questions

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31 questions · self-marked practice — reveal the answer and mark yourself.

Question 21 Mark
A letter of English alphabets is chosen at random. The probability that it is a consonant is ____________ .
Answer
$\frac{21}{26}$
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Question 31 Mark
A die has its six faces marked 0, 1, 1, 1, 6, 6. If two such dice are thrown together, then the probability of getting a total of 7 is ____________ .
Answer
$\frac{1}{3}$
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Question 41 Mark
A box contains 5 apples, 6 oranges and 'x' bananas. If the probability of selecting an apple from the box is $1 / 3$ then the number of bananas is ____________ .
Answer
4
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Question 51 Mark
Two numbers 'a' and 'b' are selected, successively without replacement in that order, from integers 1 to 10. The probability that a/b is an integer, is ____________ .
Answer
$\frac{17}{90}$
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Question 81 Mark
If the probability of getting a bad egg in a lot of 400 is 0.035, then the number of bad eggs in the lot is ____________ .
Answer
14
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Question 91 Mark
A girl calculates that the probability of her winning the first prize in a lottery is 0.08. If 6000 tickets are sold, then the number of tickets she bought, is ____________ .
Answer
480
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Question 101 Mark
A number is selected from the set {1, 2, 3, 4, 5, 6, 7, 8} The probability that it is a root of the equation $x^2-6 x+8$ = 0, is ____________ .
Answer
$\frac{1}{4}$
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Question 111 Mark
Three dice are thrown together, the probability of getting the same number on all the dice is ____________ .
Answer
$\frac{1}{36}$
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Question 121 Mark
Two dice are thrown together, the probability of getting a doublet is ____________ .
Answer
$\frac{1}{6}$
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Question 131 Mark
If one natural number is selected from the first 70 natural numbers, the probability that it is a solution of the inequation 3x - 2 > x + 42 is ____________ .
Answer
$\frac{7}{10}$
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Question 141 Mark
An urn 6 blue and x green balls. If the probability of drawing a green ball is double that of drawing a blue ball, then x = ____________ .
Answer
12
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Question 151 Mark
An urn contains 9 red balls and x green balls. If the probability of picking a red ball is thrice that of picking a green ball, then x = ____________ .
Answer
3
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Question 181 Mark
The probability of an event (other than sure and impossible event) lies between ____________ .
Answer
0 and 1
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Question 211 Mark
Getting any one of the numbers from 1 to 6 on the upper face of a die when thrown is called ____________ event.
Answer
certain
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Question 221 Mark
The probability expressed as a percentage of a particular occurrence can never be less than ____________ and greater than ____________ .
Answer
0, 100
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Question 241 Mark
If $A^c$ or $\bar{A}$ or $A^{\prime}$ denote the complement of an event $A$, then $P\left(A^c\right)$ = ____________ .
Answer
1 - P(A)
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Question 271 Mark
An event obtained by combining two or more elementary events is called a ____________ event.
Answer
compound
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Question 291 Mark
The set of all possible outcomes of a random experiment is called the ____________ .
Answer
sample space
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Question 311 Mark
An experiment in which all the outcomes are known in advance and the exact outcome is not known in advance is called a ____________ experiment.
Answer
random/non-deterministic
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