1.no of words of 4 letters that can b formed with the letter of the word IITJEE.2. 4 points out of 8 points are collinear, thn no. of quadilaterals cn b formed by thm?

1-78

make diff. cases

Qno1

    iitjee has six letters hence each of the four letters can be in 6! ways

    hence no of words formed is 4*6! words

Qno2

   no of quadrilaterals formed from 8 points is 8c4

    4 of which are collinear no quadrilaterals are formed

   hence no of quad formed is 8c4-4c4