Math
posted by Sherri .
Given the digits 1,2,5,7,8,9,0 and if repetition are not allowed, answer each of the following:
A) how many 3 digit numbers canbve formed that are divisible by 5?
•i got 6x6x1
B) how many numbers would be less then 800(must be 3 digit and divisible by 5)?

Math 
Steve
A
The last digit must be 0 or 5, and the 1st digit is not 0, so
ending in 0: 5*4*1
ending in 5: 4*4*1
B
toss out all those starting with 8 or 9.
Respond to this Question
Similar Questions

Data management
from the digits 0,1,2,3,4,5,6,7,8,9 find the number of a) 4digit numbers with repetition of digits b) 4digit numbers without repetition of digits c) the number of odd 4digit numbers with no repetition of digits d) the number of … 
data management
from the digits 0,1,2,3,4,5,6,7,8,9 find the number of a) 4digit numbers with repetition of digits b) 4digit numbers without repetition of digits c) the number of odd 4digit numbers with no repetition of digits d) the number of … 
math
how many seven digit numbers can be formed with the digits 1,2,4,7 if NO repetition is allowed 
math
How many 4digit numbers can be formed using the digits 1, 2, 3, 4, 5, 6, 7 if repetition of digits is allowed? 
holy heart
Using digits 2, 3, 5, 6, 7 and 9, how many 3digit numbers can be formed that are divisible by 5 such that the repetition of digits is not allowed? 
algebra
Consider making a fourdigit I.D. number using the digits 3,5,8, and 0 a. How many I.D. numbers can be formed using each digit once? 
math
How many five digit numbers can be formed for the set { 0,1,2,3,4,5,6,7,8,9} if zero cannot be the first digit and the given condition for each is to be satisfied? 
math
three digit numbers are to be formed from digits 0,1,2,3...9 if repetitionis allowed. (a) how many of such numbers can be formed? 
Math
How many different 2 digit numbers can be formed from the digits 16, if repetition is not allowed? 
math
How many 3digit numbers can be formed using the digits 1, 2, 3, 4, 5, 6, 7 if repetition of digits is not allowed?