Probability Mcqs

Q.  10 books are placed at random in a shelf. The probability that a pair of books will always be together is_________?

a. 1/10
b. 9/10
c. 1/5
d. 3/10


ANSWER: See Answer
 
10 books can be rearranged in 10! ways consider the two books taken as a pair then number of favourable ways of getting these two books together is 9! 2!

Required probability = 1/5
MCQs:  A coin is tossed live times. What is the probability that there is at the least one tail?
Category: Mathematics Quizzes,   Published by: T-Code Scripts
MCQs:  The probability that a number selected at random from the first 50 natural numbers is a composite number is__________?
Category: Mathematics Quizzes,   Published by: T-Code Scripts
MCQs:  If the number obtained on interchanging the digits of a two-digit number is 18 more than the original number and the sum of the digits is 8, then what is the original number ?
Category: Mathematics Quizzes,   Published by: T-Code Scripts
MCQs:  A two-digit number is such that the product of the digits is 8. When 18 is added to the number, then the digits are reversed. The number is :_________?
Category: Mathematics Quizzes,   Published by: T-Code Scripts
MCQs:  Find the number which when multiplied by 15 is increased by 196.
Category: Mathematics Quizzes,   Published by: T-Code Scripts
MCQs:  The sum of the squares of three numbers is 138, while the sum of their products taken two at a time is 131. Their sum is :___________?
Category: Mathematics Quizzes,   Published by: T-Code Scripts
MCQs:  Three numbers are in the ratio of 3 : 4 : 6 and their product is 1944. The largest of these numbers is :___________?
Category: Mathematics Quizzes,   Published by: T-Code Scripts
MCQs:  If the sum of a number and its square is 182, what is the number ?
Category: Mathematics Quizzes,   Published by: T-Code Scripts
MCQs:  The sum of two numbers is 25 and their differenee is 13. Find their product :
Category: Mathematics Quizzes,   Published by: T-Code Scripts
MCQs:  If the sum of two numbers is 33 and their difference is 15, the smaller number is :__________?
Category: Mathematics Quizzes,   Published by: T-Code Scripts
MCQs:  What is the ratio of Faheem’s salary to Imran’s salary to Naveed’s salary if Faheem makes 80,000 rupees ,Imran 70,000 rupees and Naveed makes 50,000 rupees ?
Category: Mathematics Quizzes,   Published by: T-Code Scripts
MCQs:  Two numbers are in the ratio 5:4 and their difference is 10.What is the largest number?
Category: Mathematics Quizzes,   Published by: T-Code Scripts
MCQs:  In what ratio should the profit be divided if M, N, O invests capital in ratio 2:3:5 and their timing of their investments are in the ratio 4:5:6.
Category: Mathematics Quizzes,   Published by: T-Code Scripts
MCQs:  A bag contains 50 paise, 1 rupee and 2 rupee coins in the ratio 2:5:8. If the total amount is Rs. 352, find the total number of coins in the bag.
Category: Mathematics Quizzes,   Published by: T-Code Scripts
MCQs:  Three quantities X, Y and Z are such that XY=kZ where k is constant. Initially, X was at 4 and X:Y:Z was 2:3:4. If the value of Y is changed to 12 and Z is kept constant, find the value of X.
Category: Mathematics Quizzes,   Published by: T-Code Scripts
MCQs:  Find the mean proportion between 5 and 45.
Category: Mathematics Quizzes,   Published by: T-Code Scripts
MCQs:  If X:Y = 2:3, Y:Z = 4:5. Find X:Y:Z.
Category: Mathematics Quizzes,   Published by: T-Code Scripts
MCQs:  The ratio of two numbers a and b is 3:5. If 2 is added to both the numbers, the ratio becomes 2:3. Find b.
Category: Mathematics Quizzes,   Published by: T-Code Scripts
MCQs:  The plan for a rectangular area is drawn to a scale of 1:500. If the length and breadth in the plan is 30 cm and 20 cm, find the actual area.
Category: Mathematics Quizzes,   Published by: T-Code Scripts
MCQs:  The length and breadth of a rectangle are in the ratio 5:4. Find its perimeter if its area is 180 cm²
Category: Mathematics Quizzes,   Published by: T-Code Scripts