Permutations and Combinations questions
785 published questions with worked solutions.
- If ^ 12 P_r=1320, then r is equal to
- There are 10 true-false questions in an examination. Then, these questions can be answered in
- If there are n number of seats and m number of people have to be seated, then how many ways are possible to do this (m<n)?
- The number of permutations by taking all letters and keeping the vowels of the word COMBINE in the odd places is
- The number of seven digit integers, with sum of the digits equal to 10 and formed by using the digits 1,2 and 3 only, is
- How many ways are there to arrange the letters in the word 'GARDEN' with the vowels in alphabetical order?
- The number of natural numbers less than 1000, in which no two digits are replaced, is
- All the words that can be formed using alphabets A,H,L,U,R are written as in a dictionary (no alphabet is replaced). Then, the...
- 9 balls are to be placed in 9 boxes and 5 of the balls cannot fit into 3 small boxes. The number of ways of arranging one ball in...
- Eight chair are numbered 1 to 8. Two women and three men wish to occupy one chair each. First the women choose the chairs from...
- The number of different words that can be formed from the letters of the word 'PENCIL' so that no two vowels are together, is
- The number of ways in which 5 boys and 5 girls can be seated for a photograph so that no two girls sit next to each other is
- How many numbers greater than 40000 can be formed from the digits 2,4,5,5,7?
- How many numbers lying between 999 and 10000 can be formed with the help of the digits 0,2,3,6,7,8 when the digits are not...
- The sum of all five digit numbers that can be formed using the digits 1,2,3,4,5 when repetition of digits is not allowed, is
- If all permutations of the letters of the word AGAIN are arranged as in dictionary, then fiftieth word is
- Let 1,2,3,4 are four numbers. How many numbers can be made using all four numbers?
- The number of different permutations of the word 'BANANA' is
- How many four digit numbers can be formed using the digits 1,2,3,4,5 such that at least one of the digit is repeated?
- How many words can be formed from the letters of the word DOGMATIC, if all the vowels remain together?
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