EASY
11th West Bengal Board
IMPORTANT
Earn 100

In how many ways can 10 books be arranged in a shelf so that a particular pair of books shall be always together?

50% studentsanswered this correctly

Important Questions on Permutations and Combinations

MEDIUM
11th West Bengal Board
IMPORTANT
WBCHSE Mathematics for Class 11>Chapter 30 - Permutations and Combinations>EXERCISE 1>Q 38
In how many ways can 10 books be arranged in a shelf so that a particular pair of books shall be never together?
MEDIUM
11th West Bengal Board
IMPORTANT
WBCHSE Mathematics for Class 11>Chapter 30 - Permutations and Combinations>EXERCISE 1>Q 39
How many 4-digit numbers are there when a digit may be repeated any number of times in each number ?
MEDIUM
11th West Bengal Board
IMPORTANT
WBCHSE Mathematics for Class 11>Chapter 30 - Permutations and Combinations>EXERCISE 1>Q 40
In how many ways can 6 boys be arranged in a row?
EASY
11th West Bengal Board
IMPORTANT
WBCHSE Mathematics for Class 11>Chapter 30 - Permutations and Combinations>EXERCISE 1>Q 41
In how many ways can 6 girls be seated in a circle?
MEDIUM
11th West Bengal Board
IMPORTANT
WBCHSE Mathematics for Class 11>Chapter 30 - Permutations and Combinations>EXERCISE 1>Q 42
How many diagonals are there in a polygon of n sides?
MEDIUM
11th West Bengal Board
IMPORTANT
WBCHSE Mathematics for Class 11>Chapter 30 - Permutations and Combinations>EXERCISE 1>Q 43
How many diagonals are there in an octagon ?
MEDIUM
11th West Bengal Board
IMPORTANT
WBCHSE Mathematics for Class 11>Chapter 30 - Permutations and Combinations>EXERCISE 1>Q 44
A polygon has 54 diagonals. Number of sides in this polygon is 
MEDIUM
11th West Bengal Board
IMPORTANT
WBCHSE Mathematics for Class 11>Chapter 30 - Permutations and Combinations>EXERCISE 1>Q 45
There are 10 points in a plane, out of which 4 points are collinear. The number of line segments obtained from the pairs of these points is