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ParthKohli

  • 3 years ago

Number of 3-digit palindromes... 9 ways for the hundreds place. 9 ways for the tens place. 1 way for the ones place. \(9 \times 9 \times 1 = 81\) which is wrong?

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  1. Golferguy158
    • 3 years ago
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    why is there only one way for the ones place?

  2. Golferguy158
    • 3 years ago
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    shouldn't there be 9 ways?

  3. Spacelimbus
    • 3 years ago
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    you can have 9 in the first place, and 10 in the second place. 111 is also a palindrome.

  4. ParthKohli
    • 3 years ago
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    Because the ones place is always equal to the hundreds place.

  5. ParthKohli
    • 3 years ago
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    Oh yes!

  6. Spacelimbus
    • 3 years ago
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    010 is not a 3 digit number, but a 3 digit palindrome.

  7. ParthKohli
    • 3 years ago
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    @LOOSEr I didn't consider 0 for the tens place, whoopies

  8. Spacelimbus
    • 3 years ago
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    so I would try it with 90

  9. LOOSEr
    • 3 years ago
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    9*10*1=90

  10. ParthKohli
    • 3 years ago
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    Yeah, that's right of course :-P

  11. LOOSEr
    • 3 years ago
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    10 ways for tens place

  12. Spacelimbus
    • 3 years ago
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    ^^

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