A mailman has special delivery mail for 15 customers.
(a) In how many ways can he arrange his schedule to deliver to all 15?
(b) In how many ways can he schedule deliveries if he can deliver to only 10 of the 15?
combination/permutation help!?!?
2018-03-13 6:02 am
回答 (2)
2018-03-13 2:23 pm
(a)
No. of ways
= P(15, 15)
= 15!
= 1,307,674,368,000
(b)
No. of ways
= P(15, 10)
= 15! / (15 - 10)!
= 15! / 5!
= 10,897,286,400
No. of ways
= P(15, 15)
= 15!
= 1,307,674,368,000
(b)
No. of ways
= P(15, 10)
= 15! / (15 - 10)!
= 15! / 5!
= 10,897,286,400
2018-03-13 7:52 am
a/
15!
b/
P(15,10) = ...calculator
15!
b/
P(15,10) = ...calculator
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