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Let the third proportional z. ATQ- (x² – y²) :(x–y): (x–y): z z × (x² – y²) = (x–y) × (x–y) =(x–y) × (x–y) / (x² – y²) =(x-y)/(x+y).
Among a set of 4 black balls and 3 white balls, how many selections of 3 balls can be made such that at least 2 of them are black balls?
In how many ways can 7 boys and 2 girls can be seated in a row so that they are in alternate position.
If the letters of the Word SINHA are arranged in all possible ways and these words are written out as in Dictionary, then the rank of the word SINHA is
How many unique arrangements can be made using all the letters of the word "DELUSION", ensuring that the vowels do not appear together?
In how many ways can the letters of the word ENGINEERING be arranged?
Find the number of words formed by using all the letter of the word MEMBER, so that the vowels are always together.
...Find the no. of words formed by using all the letter of the word DISCOUNT, so that the vowels are never together?
Find the number of words that can be formed by using all letters of the word 'ESCAPE', if it starts with letter C and end with letter P.
