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How many different -letter words can be formed with the letter of word when and are always to be excluded?
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Important Questions on Permutations & Combinations
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The number of three-digit numbers having only two consecutive digits identical is
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If all the letters of the word are arranged in all possible manner as they are in a dictionary, then the rank of the word is
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The total number of ways in which men and women can be arranged in a line so that no women are together is
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Let there be fixed points on the circumference of a circle. Each of these points is joined to every one of the remaining points by a straight line and the points are so positioned on the circumference that at most straight lines meet in any interior point of the circle. The number of such interior intersection points is
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The number of ways in which rings can be worn on the four fingers of one hand is
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With consonants and vowels the number of words of four letters that can be formed having two different vowels in the middle and one consonant, repeated or different at each end is
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In a class of students, there are girls. In how many different ways can all the students be arranged in a row such that no two of the three girls are consecutive
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The number of words that can be formed out of the letters of the word is
