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Pulsified333

  • one year ago

Assume that you select digits from the set {2,3,5,6,7,8} to form a number between 20 and 800. (1) How many such numbers can be formed if digits are not repeated? (2) How many such numbers can be formed if digits can be repeated?

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  1. dan815
    • one year ago
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    all 2 digit numbers are above 20 so u are good there then all 3 digit numbers that dont start with 8 are below 800

  2. dan815
    • one year ago
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    no repeition 2 digit numbers 6*5 3 digit numbers with out 8 in beginning 5*5*4

  3. dan815
    • one year ago
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    with repetition alloved 2 digit numbers 6*6 3 digit numbers 5*6*6

  4. dan815
    • one year ago
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    |dw:1441335919908:dw|

  5. Pulsified333
    • one year ago
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    oh that makes sense now :D. I got it right . By the way what you said helped on the other problem because I got it right. :D

  6. dan815
    • one year ago
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    which one again?

  7. Pulsified333
    • one year ago
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    it was the base 8 one

  8. dan815
    • one year ago
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    oh okay thats good!

  9. Pulsified333
    • one year ago
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    the answer was 53602

  10. dan815
    • one year ago
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    u understand bases now?

  11. dan815
    • one year ago
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    i cann check for u wait

  12. Pulsified333
    • one year ago
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    yeah I think I do

  13. Pulsified333
    • one year ago
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    was it right?

  14. dan815
    • one year ago
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    yeah

  15. dan815
    • one year ago
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    sry i went off writing a program hehe

  16. Pulsified333
    • one year ago
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    :D

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