EASY
11th West Bengal Board
IMPORTANT
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Find the number of diagonals of a polygon of 16 sides.

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Important Questions on Permutations and Combinations

EASY
11th West Bengal Board
IMPORTANT
WBCHSE Mathematics for Class 11>Chapter 7 - Permutations and Combinations>EXERCISE 5I>Q 12
How many straight lines can be obtained by joining 12 points, 5 of which are collinear?
EASY
11th West Bengal Board
IMPORTANT
WBCHSE Mathematics for Class 11>Chapter 7 - Permutations and Combinations>EXERCISE 5I>Q 12
How many triangles can be obtained by joining 12 points, five of which are collinear?
EASY
11th West Bengal Board
IMPORTANT
WBCHSE Mathematics for Class 11>Chapter 7 - Permutations and Combinations>EXERCISE 5I>Q 13
How many lines can be drawn through n points on a circle?
EASY
11th West Bengal Board
IMPORTANT
WBCHSE Mathematics for Class 11>Chapter 7 - Permutations and Combinations>EXERCISE 5I>Q 13
How many triangles can be drawn through n points on a circle?
EASY
11th West Bengal Board
IMPORTANT
WBCHSE Mathematics for Class 11>Chapter 7 - Permutations and Combinations>EXERCISE 5I>Q 14
A polygon has 44 diagonals. Find the number of its sides.
EASY
11th West Bengal Board
IMPORTANT
WBCHSE Mathematics for Class 11>Chapter 7 - Permutations and Combinations>EXERCISE 5I>Q 15
From a class of 14 boys and 10 girls, 10 students are to be chosen for a competition, at least including 4 boys and 4 girls. The 2 girls who won the prizes last year should be included. In how many ways can the selection be made?
EASY
11th West Bengal Board
IMPORTANT
WBCHSE Mathematics for Class 11>Chapter 7 - Permutations and Combinations>EXERCISE 5I>Q 16
In a village, there are 87 families of which 52 families have at most 2 children. In a rural development program, 20 families are to be chosen for assistance, of which at least 18 families must have at most 2 children. In how many ways can the choice be made?
EASY
11th West Bengal Board
IMPORTANT
WBCHSE Mathematics for Class 11>Chapter 7 - Permutations and Combinations>EXERCISE 5I>Q 17
A committee of 5 is to be selected from among 6 boys and 5 girls. Determine the number of ways of selecting the committee if it is to consist of at least 1 boy and 1 girl.