Question
How many chords can be drawn through 21 points on a circle?
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| $P(A)$ | $P(B)$ | $\text{P}({\text{A}}\cap{\text{B}})$ | $\text{P}({\text{A}}\cup{\text{B}})$ | |
| $(i)$ | $\frac{1}{3}$ | $\frac{1}{5}$ | $\frac{1}{15}$ | $.......$ |
| $(ii)$ | $0.35$ | $....$ | $0.25$ | $0.6$ |
| $(iii)$ | $0.5$ | $0.35$ | $....$ | $0.7$ |