Math

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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 -

    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.

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