Question

find the no. of four letter words that can be formed using the letters of the word FAILURE. (i)when f is included in each word (ii) when f is not included in any word
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Answer 1

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Answer:

480

Step-by-step explanation:

There are 7 letters in the word failure. If F is included in each four-letter words, it means we have to arrange 6 letters taking 3 at a time which is P(6,3)=120.

Again, if is not included, then we have to arrange 6 letters taking 4 at a time which is P(6,4)=360

so totally 120 + 360 = 480

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