SOLUTION: from the numbers 1, 2, 3, 4, 5, 6, 7, 8, and 9, four different numbers are selected to form a four-digit number. a. how many four-digit numbers can be formed? b. how many four-

Algebra ->  Permutations -> SOLUTION: from the numbers 1, 2, 3, 4, 5, 6, 7, 8, and 9, four different numbers are selected to form a four-digit number. a. how many four-digit numbers can be formed? b. how many four-      Log On


   

Question 1173254: from the numbers 1, 2, 3, 4, 5, 6, 7, 8, and 9, four different numbers are selected to form a four-digit number.
a. how many four-digit numbers can be formed?
b. how many four-digit numbers less than 2,000 can be formed?
c. how many four-digit even numbers can be formed?
thank you so much, really appreciate your help
Answer by ikleyn(52780) About Me  (Show Source):
You can put this solution on YOUR website!
.

Part (a) is just answered.

Part (b) is just answered.

Part  (c)  breaks down in two parts,  whether the repeating is allowed or not.


Do not try to pack many questions into one post ---- it  ALWAYS  works  AGAINST  you.

And against the rules of this forum,  that require

        One and ONLY ONE question per post.