MEDIUM
NDA & NA EE
IMPORTANT
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Let x be the number of integers lying between 2999 and 8001 which have at least two digits equal. Then x is equal to

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Important Questions on Permutation and Combination

HARD
NDA & NA EE
IMPORTANT
Mathematics Crash Course NDA & NA EE>Chapter 17 - Permutation and Combination>Exercise 1>Q 10
Number of numbers greater than a million and divisible by 5 which can be formed by using only the digits 1, 2, 1, 2, 0, 5 & 2 is -
MEDIUM
NDA & NA EE
IMPORTANT
Mathematics Crash Course NDA & NA EE>Chapter 17 - Permutation and Combination>Exercise 1>Q 11
5 boys & 3 girls are sitting in a row of 8 seats. Number of ways in which they can be seated so that not all the girls sit side by side, is
MEDIUM
NDA & NA EE
IMPORTANT
Mathematics Crash Course NDA & NA EE>Chapter 17 - Permutation and Combination>Exercise 1>Q 12
The number of ways of arranging the letters AAAAA, BBB, CCC, D, EE and F in a row if no two ‘C’s are together :
MEDIUM
NDA & NA EE
IMPORTANT
Mathematics Crash Course NDA & NA EE>Chapter 17 - Permutation and Combination>Exercise 1>Q 13
The total number of permutation of n n>1 different things taken not more than r at a time, when each thing may be repeated any number of times, is
MEDIUM
NDA & NA EE
IMPORTANT
Mathematics Crash Course NDA & NA EE>Chapter 17 - Permutation and Combination>Exercise 1>Q 14
If all the letters of the word QUEUE are arranged in all possible manner as they are in a dictionary, then the rank of the word QUEUE is
EASY
NDA & NA EE
IMPORTANT
Mathematics Crash Course NDA & NA EE>Chapter 17 - Permutation and Combination>Exercise 1>Q 15
The number of 5 digit telephone numbers having at least one of their digits repeated is
EASY
NDA & NA EE
IMPORTANT
Mathematics Crash Course NDA & NA EE>Chapter 17 - Permutation and Combination>Exercise 1>Q 16
Four dices (six-faced) are rolled. The number of possible outcomes in which at least one die shows 2 is
EASY
NDA & NA EE
IMPORTANT
Mathematics Crash Course NDA & NA EE>Chapter 17 - Permutation and Combination>Exercise 1>Q 17
In how many ways 4 boys and 3 girls can be seated in a row, so that they are alternate?