Question 1062501: a) how many 3-digit numbers can be formed using only 2,3,5,6,7 and 9 with no repeats?
b)how many of these numbers are less than 400?even?odd?multiple of5?
Answer by Alan3354(69443)   (Show Source):
You can put this solution on YOUR website! a) how many 3-digit numbers can be formed using only 2,3,5,6,7 and 9 with no repeats?
---------
The 1st # is 1 of 6.
Then 1 of 5, then 1 of 4
--> 6*5*4 = 120
=============
b)how many of these numbers are less than 400?
Same as above, except the 1st # is 2 or 3, --> 1 of 2
===============
even?
Similar to above
=============
odd?
multiple of 5?
|
|
|
