**Question:**

Re write each of the following statements in the form “*p* if and only if *q*”.

(i) *p*: If you watch television, then your mind is free and if your mind is free, then you watch television.

(ii) *q*: For you to get an A grade, it is necessary and sufficient that you do all the homework regularly.

(iii) *r*: If a quadrilateral is equiangular, then it is a rectangle and if a quadrilateral is a rectangle, then it is equiangular.

**Solution:**

(i) You watch television if and only if your mind is free.

(ii) You get an A grade if and only if you do all the homework regularly.

(iii) A quadrilateral is equiangular if and only if it is a rectangle.