Math

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)?

asked by Sherri
  1. 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.

    posted by Steve

Respond to this Question

First Name

Your Response

Similar Questions

  1. 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? (b)how manyof the numbers in(a)are divisible by 3 and how many of 9? (c) find the sum of all the
  2. holy heart

    Using digits 2, 3, 5, 6, 7 and 9, how many 3-digit numbers can be formed that are divisible by 5 such that the repetition of digits is not allowed?
  3. algebra

    Consider making a four-digit I.D. number using the digits 3,5,8, and 0 a. How many I.D. numbers can be formed using each digit once? b. How many can be formed using each digit once and not using 0 first? c. How many can be formed
  4. math

    How many 4-digit numbers can be formed using the digits 1, 2, 3, 4, 5, 6, 7 if repetition of digits is allowed? Would that be 840
  5. math

    How many 3-digit numbers can be formed using the digits 1, 2, 3, 4, 5, 6, 7 if repetition of digits is not allowed?
  6. Math

    How many different 2 digit numbers can be formed from the digits 1-6, if repetition is not allowed?
  7. math

    how many seven digit numbers can be formed with the digits 1,2,4,7 if NO repetition is allowed
  8. Algebra

    How many odd three -digit numbers can be formed if the tens digit must be 4 ?(Repetition of digits is allowed and zero cannot be the hundreds’ digit)
  9. math problem

    My ID number is quite remarkable.Its a 9 digit number with the digits 1-9 appearing only once. The entire 9 digit nuymber is divisible by 9. If you remove the last digit, the remaining 8 digit number is divisible by 8. If you
  10. 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? A. Repetitions are allowed and the number must be even. B.

More Similar Questions