6Pr = 6 Thus r = 1 N.B 6P1 = \(\frac{\text{6!}}{\text{(6 - 1)!}}\) = \(\frac{\text{6!}}{\text{5!}}\) = \(\frac{6 \times \text{5!}}{\text{5!}}\) = 6 6Pr + 1 = 6P2 = \(\frac{\text{6!}}{(6 - 2)\text{!}} = \frac{6\text{!}}{\text{4!}}\) = \(\frac{6 \times 5 \times \text{4!}}{\text{4!}}\) = 30