## 26. How many words can be formed by re-arranging the letters of the word **ASCENT** such that A and T occupy the first and last position respectively?

**ASCENT**such that A and T occupy the first and last position respectively?

## 27. If ^{6}P_{r} = 360 and If ^{6}C_{r} = 15, find r ?

^{6}P

_{r}= 360 and If

^{6}C

_{r}= 15, find r ?

## 28. In how many ways can six different rings be worn on four fingers of one hand?

## 29. There are 7 non-collinear points. How many triangles can be drawn by joining these points?

## 30. From 6 men and 4 ladies, a committee of 5 is to be formed. In how many ways can this be done, if the committee is to include at least one lady?

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