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(i) Find the number of four letter word that can be formed from the letters of the word HISTORY. ( each letter to be used at most once)
(ii) How many contain both vowels?

Harish , 8 Years ago
Grade 12
anser 1 Answers
Deepak Kumar Shringi

Last Activity: 7 Years ago

total no of words of 4 letters=7C44! (select 4 letters out of 7 and then arrange them )
words with both vowels=5C24! (2 vowels + now select 2 from remaining 5 consonants arrangement of 4 letters in a row is 4!)

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