HARD
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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 rank of the word RAHUL is
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Important Questions on Permutation and Combination
HARD
The number of digit numbers without repetition that can be formed using the digits in which each number has two odd digits and two even digits is
EASY
The number of digit number that can be formed using the digits and which are divisible by and no digit is repeated is:
EASY
In how many ways the letters of word 'MACHINE' can be arranged so that vowels will always be together?
HARD
There are red and yellow roses of different sizes. If is the number of garlands that can be formed with all these flowers so that no two yellow roses come together and is the number of garlands formed with all these flowers so that all the red roses coming together, then
MEDIUM
From different novels and different dictionaries, novels and dictionary are to be selected and arranged in a row on a shelf so that the dictionary is always in the middle. The number of such arrangements is:
EASY
If the number of all possible permutations of the letters of the word in which the repeated letters are not together is , then
EASY
How many numbers of four digits can be made by using the digits and ? (Repetition of digits is not allowed)
EASY
If Then, the value of is
HARD
If all the words (with or without meaning) having five letters, formed using the letters of the word and arranged as in a dictionary; then the position of the word is
HARD
All possible numbers are formed using the digits taken all at a time. The number of such numbers in which the odd digits occupy even places is
MEDIUM
If all possible numbers are formed by using the digits without repetition and they are arranged in descending order, then the rank of the number is
MEDIUM
If all the words, with or without meaning, are written using the letters of the word QUEEN and are arranged as in English dictionary, then the position of the word QUEEN is:
EASY
In a storied building, persons enter a lift cabin. It is known that they will leave the lift at different floors. In how many ways can they do so if the lift does not stop at the second floor?
EASY
Six identical coins are arranged in a row. The number of ways in which the number of tails is equal to the number of heads is
MEDIUM
The number of four-letter words that can be formed with letters such that all three letters occur is
MEDIUM
A dictionary is printed consisting of letters words only that can be made with a letters of word CRICKET. If the words are printed at the alphabetical order as in an ordinary dictionary, then the number of words before the word CRICKET is
MEDIUM
The number of words with or without meaning which can be made using all the letters of the word AGAIN. If these words are written as in a dictionary, then the word will be
MEDIUM
The number of four-digit numbers strictly greater than that can be formed using the digit (repetition of digits is allowed) is:
EASY
The sum of the digits in the unit's place of all the - digit numbers formed by using the numbers and, without repetition is :
MEDIUM
Two girls and four boys are to be seated in a row in such a way that the girls do not sit together. In how many different ways can it be done?
