QuickHelper

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Category > Math Posted 13 Sep 2017 My Price 5.00

Permutations Math 211

How many different numbers can be formed using 6 out of 9 digits 1,2,3,...,9 if the numbers: 

a) are not repeated?

B) can be repeated?

c) are not repeated but must begin with the digit 2?

d) are not repeated but must begin with the digits 21?

Answers

QuickHelper
(10)
Status NEW Posted 13 Sep 2017 07:09 AM My Price 5.00

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