## 11. In how many ways can the letters of the word ‘MOMENT’ be arranged?

## 12. There are six teachers. Out of them two are primary teachers and two are secondary teachers. They are to stand in a row, so as the primary teachers, middle teachers and secondary teachers are always in a set . The number of ways in which they can do so, is-

## 13. In how many different ways can the letters of the word SOFTWARE be arranged in such a way that the vowels always come together?

## 14. A committee of 5 members is to be formed by selecting out of 4 men and 5 women. In how many different ways the committee can be formed if it should have at least 1 man?

## 15. In how many ways can the letters of the word MATHEMATICS be arranged so that all the vowels always come together?

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