Question
How many such pairs of letters are there in the word
‘DEHRADUN’ (in both forward and backward directions) each of which has as many letters between them in the word as in the English alphabetical order?Solution
DE, RU and RN
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Using all the letters of the word CANOER, how many words start with a vowel but end with a consonant?
You have 4 distinct cubes and 2 distinct balls. Find the number of ways to arrange them such that all 4 cubes are not placed together.
Five articles out of which 3 are cups and rest are glasses have to be arranged on a shelf. Find the number of ways of arrangement in which all three cup...
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History books are never together.
In how ways can the selection be made so that a particular member is always excluded?  Â
How many numbers of five digits may be formed with the digits 5, 0, 9, 0, and 6?
