ParthKohli
  • ParthKohli
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?
Mathematics
schrodinger
  • schrodinger
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anonymous
  • anonymous
why is there only one way for the ones place?
anonymous
  • anonymous
shouldn't there be 9 ways?
anonymous
  • anonymous
you can have 9 in the first place, and 10 in the second place. 111 is also a palindrome.

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ParthKohli
  • ParthKohli
Because the ones place is always equal to the hundreds place.
ParthKohli
  • ParthKohli
Oh yes!
anonymous
  • anonymous
010 is not a 3 digit number, but a 3 digit palindrome.
ParthKohli
  • ParthKohli
@LOOSEr I didn't consider 0 for the tens place, whoopies
anonymous
  • anonymous
so I would try it with 90
anonymous
  • anonymous
9*10*1=90
ParthKohli
  • ParthKohli
Yeah, that's right of course :-P
anonymous
  • anonymous
10 ways for tens place
anonymous
  • anonymous
^^

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