Alana11 Alana11
  • 21-09-2015
  • Mathematics
contestada

How many 4 digit palindromes contain both the digits 1 and 2

Respuesta :

AL2006
AL2006 AL2006
  • 21-09-2015

What a clever sneaky little problem !

There can only be two of them:    1221  and  2112 .

Answer Link

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