MEDIUM
11th CBSE
IMPORTANT
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A letter lock consists of three rings each marked with 10 different letters. In how many ways it is possible to make an unsuccessful attempt to open the lock?

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Important Questions on Permutations

EASY
11th CBSE
IMPORTANT
MATHEMATICS for CLASS XI>Chapter 16 - Permutations>EXERCISE 16.2>Q 10
There are 6 multiple choice questions in an examination. How many sequences of answers are possible, if the first three questions have 4 choices each and the next three have 2 each?
MEDIUM
11th CBSE
IMPORTANT
MATHEMATICS for CLASS XI>Chapter 16 - Permutations>EXERCISE 16.2>Q 11
There are 5 books on Mathematics and 6 books on Physics in a book shop. In how many ways can a student buy a Mathematics book and a Physics book.
EASY
11th CBSE
IMPORTANT
MATHEMATICS for CLASS XI>Chapter 16 - Permutations>EXERCISE 16.2>Q 12
There are 5 books on Mathematics and 6 books on Physics in a book shop. In how many ways can a student buy either a Mathematics book or a Physics book?
EASY
11th CBSE
IMPORTANT
MATHEMATICS for CLASS XI>Chapter 16 - Permutations>EXERCISE 16.2>Q 13
Given 7 flags of different colours, how many different signals can be generated if a signal requires the use of two flags, one below the other?
EASY
11th CBSE
IMPORTANT
MATHEMATICS for CLASS XI>Chapter 16 - Permutations>EXERCISE 16.2>Q 14
A team consists of 6 boys and 4 girls and other has 5 boys and 3 girls. How many single matches can be arranged between the two teams when a boy plays against a boy and a girl plays against a girl?
EASY
11th CBSE
IMPORTANT
MATHEMATICS for CLASS XI>Chapter 16 - Permutations>EXERCISE 16.2>Q 15
Twelve students compete in a race. In how many ways first three prizes be given?
EASY
11th CBSE
IMPORTANT
MATHEMATICS for CLASS XI>Chapter 16 - Permutations>EXERCISE 16.2>Q 16
How many A.P.’s with 10 terms are there whose first term is in the set 1,2,3 and whose common difference is in the set 1,2,3,4,5?
EASY
11th CBSE
IMPORTANT
MATHEMATICS for CLASS XI>Chapter 16 - Permutations>EXERCISE 16.2>Q 17
From among the 36 teachers in a college, one principal, one vice-principal and the teacher-in charge are to be appointed. In how many ways can this be done?