66. Match the following:
| Column I | Column II |
|---|---|
| (i) \(\dfrac{a}{b} \div \dfrac{a}{b}\) | (a) \(-\dfrac{a}{b}\) |
| (ii) \(\dfrac{a}{b} \div \dfrac{c}{d}\) | (b) \(-1\) |
| (iii) \(\dfrac{a}{b} \div (-1)\) | (c) 1 |
| (iv) \(\dfrac{a}{b} \div \dfrac{-a}{b}\) | (d) \(\dfrac{bc}{ad}\) |
| (v) \(\dfrac{b}{a} \div (\dfrac{d}{c})\) | (e) \(\dfrac{ad}{bc}\) |
(i) ↔ (c)
(ii) ↔ (e)
(iii) ↔ (a)
(iv) ↔ (b)
(v) ↔ (d)
(i) \(\dfrac{a}{b} \div \dfrac{a}{b} = 1\).
(ii) \(\dfrac{a}{b} \div \dfrac{c}{d} = \dfrac{ad}{bc}\).
(iii) \(\dfrac{a}{b} \div (-1) = -\dfrac{a}{b}\).
(iv) \(\dfrac{a}{b} \div \dfrac{-a}{b} = -1\).
(v) \(\dfrac{b}{a} \div \dfrac{d}{c} = \dfrac{bc}{ad}\).