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In how many ways can the letters of the word PARALLEL be arranged so that all the L's do not come together?
In how many different ways can the letters of the word ‘CURIOES’ be arranged in such a way that the vowels occupy only the odd positions?
Geography books are always together.
In a group of 9 boys and 6 girls, 5 students have to be selected. In how many ways it can be done so that only 2 boys are included.
In how ways can the selection be made so that a particular member is always excluded?
A person has 12 friends out of which 7 are relatives. In how many ways can he invite 6 friends such that at least 4 of them are relatives?
Out of 10 men, 3 are wearing red caps, 4 are wearing green caps, and the remaining men are wearing orange caps. They are to be seated in a linear row. I...
In how ways can the selection be made so that a particular member is always excluded?
How many different words can be formed with the letters of the word PRACTICE such that each of the word begin with E and ends with R?
A box contains 2 blue, 3 black and 5 orange balls. In how many ways can 3 balls be drawn from the box, if at least 1 black ball is to be included in the...
