NDA · Mathematics
Permutation Combination
129 practice questions for NDA — 23 easy · 93 medium · 13 hard. Every question is graded instantly with a step-by-step solution when you miss it.
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MCQ
How many odd numbers between 300 and 400 are there in which none of the digits is repeated?
MCQ
5 - digit numbers are formed using the digits $0,1,2,4,5$ without repetition. What is the percentage of numbers which are greater than 50,000 ?
MCQ
What is the number of words that can be formed from the letters of the word 'UNIVERSAL', the vowels remaining always together?
MCQ
How many four-digit natural numbers are there such that all of the digits are odd?
MCQ
How many four-digit natural numbers are there such that all of the digits are even?
MCQ
How many permutations are there of the letters of the word 'TIGER' in which the vowels should not occupy the even positions?
MCQ
If different words are formed with all the letters of the word 'AGAIN' and are arranged alphabetically among themselves as in a dictionary, the word at the 50th place will be
MCQ
Where $A^{\prime}$ is the complement of $A$. Let $x$ be the number of integers lying between 2999 and 8001 which have at least two digits equal. Then x is equal to
MCQ
How many 4-digit numbers are there having all digits as odd?
MCQ
In how many ways can the letters of the word INDIA be permutated such that in each combination, vowels should occupy odd positions?
MCQ
Let $x$ be the number of permutations of the word 'PERMUTATIONS' and $y$ be the number of permutations of the word 'COMBINATIONS'. Which one of the following is correct?
MCQ
The letters of the word EQUATION are arranged in such a way that all vowels as well as consonants are together. How many such arrangements are there?