EASY
JEE Advanced
IMPORTANT
Earn 100

Twenty buses run between New Delhi to Meerut. If a man goes from Meerut to New Delhi by a bus and comes back to Meerut by another bus. The total possible ways is

50% studentsanswered this correctly

Important Questions on Permutation and Combination

EASY
JEE Advanced
IMPORTANT
Complete Study Pack for Engineering Entrances Objective Mathematics Vol 1>Chapter 6 - Permutation and Combination>Work Book Exercise 6.1>Q 2
Ten different letters of the alphabet are given. Words with five letters are formed from these given letters. Then, the total number of words which have at least one letter repeated is 
EASY
JEE Advanced
IMPORTANT
Complete Study Pack for Engineering Entrances Objective Mathematics Vol 1>Chapter 6 - Permutation and Combination>Work Book Exercise 6.1>Q 3
An examination paper contains 8 questions of which 4 have 3 possible answers, 3 have 2 possible answers and the remaining one question has 5 possible answers. The total number of possible answers to all the questions is
EASY
JEE Advanced
IMPORTANT
Complete Study Pack for Engineering Entrances Objective Mathematics Vol 1>Chapter 6 - Permutation and Combination>Work Book Exercise 6.1>Q 4
There are stalls for 10 animals in a ship. The number of ways in which ship load can be made, if there are cows, calves and horses to be transported, animals of each kind being not less than 10 is
EASY
JEE Advanced
IMPORTANT
Complete Study Pack for Engineering Entrances Objective Mathematics Vol 1>Chapter 6 - Permutation and Combination>Work Book Exercise 6.1>Q 5
A letter lock consists of three rings, each marked with 10 different letters. The number of ways in which it is possible to make an unsuccessful attempt to open the lock is
EASY
JEE Advanced
IMPORTANT
Complete Study Pack for Engineering Entrances Objective Mathematics Vol 1>Chapter 6 - Permutation and Combination>Work Book Exercise 6.1>Q 6
How many two-digit even numbers can be formed from the digits 1,2,3,4,5, if the digits can be repeated?
MEDIUM
JEE Advanced
IMPORTANT
Complete Study Pack for Engineering Entrances Objective Mathematics Vol 1>Chapter 6 - Permutation and Combination>Work Book Exercise 6.1>Q 7
A five-digit number divisible by 3 is to be formed by using the digits 0, 1, 2, 3, 4 and 5 without repetition. The total number of ways in which this can be done is
MEDIUM
JEE Advanced
IMPORTANT
Complete Study Pack for Engineering Entrances Objective Mathematics Vol 1>Chapter 6 - Permutation and Combination>Work Book Exercise 6.1>Q 8
If p, q∈1, 2, 3, 4, then the number of equations of the form px2+qx+1=0 having real roots, is
MEDIUM
JEE Advanced
IMPORTANT
Complete Study Pack for Engineering Entrances Objective Mathematics Vol 1>Chapter 6 - Permutation and Combination>Work Book Exercise 6.1>Q 9
Find the number of ordered pairs x,y, if x, y ∈ {0,1,2,3,…,10} and if x-y>5