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Total age of 18 girls = 18 × 36 = 648 years If the age of two more girls is added the average decreases by half a year, ∴ Total age of 20 girls = 35.5 × 20 = 710 Now, sum of the age of new girls = 710 – 648 = 62 years
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In how many different ways can the letters of the word ‘PADDLED’ be arranged?
In how many different ways can the letters of the word QUANTITY be arranged so that the vowels always come together?
In how many ways can 4 boys and 3 girls can be seated in a row so that they are in alternate position.
In how ways can the selection be made so that a particular member is always excluded?
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8 students appear in an examination. In how many ways can the result be announced?
In how many ways a Cricketer can make a Double century with fours and Sixes only?
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