21.
In how many ways can a committee of 4 people be chosen out of 8 people?

22.
In how many different ways can the letters of the word EXTRA be arranged so that the vowels are never together?

23.
In how many different ways can the letters of the word ‘BAKERY’ be arranged?

24.
In how many different ways can the letters of the word DAILY be arranged?

25.
In how many different ways can letters of the word OFFICES be arranged?

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