If 6Pr 6 find the value of 6Pr 1 - JAMB Mathematics 2001 Question
If 6Pr = 6, find the value of 6Pr+1
A
30
B
33
C
35
D
15
correct option: a
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
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