Evaluate, using the permutation or combination formula. (6 marks)\ a.

_(8)P_(5)

\ b.

_(11)C_(6)

\

8P_(5)=(8!)/((8-5)!)

\

_(11)C_(6)=(11!)/((11-6)!6!)

\ c.

([9],[4])

\

(8\\\\times 7\\\\times 6\\\\times 5\\\\times 4\\\\times 3\\\\times 2\\\\times y)/(3\\\\times 72\\\\times 4)

\

=(11!)/(5!6!)

\

=8\\\\times 7\\\\times 6\\\\times 5\\\\times 4=6720=

\ d.

_(5)P_(5)

\ e.

_(5)C_(5)

\ f.

_(7)P_(1)

17. Evaluate, using the permutation or combination formula. (6 marks) a. 8P5 b. 11C6 8P5=(86)!8! 11C6=(116)!6!11! c. (94) 372187654321 =5!6!11! =87654=6720 d. 5P5 e. 5C5 f. 7P1