Let the digits $a, b, c$ be in $A.P.$ Nine-digit numbers are to be formed using each of these three digits thrice such that three consecutive digits are in $A.P.$ at least once. How many such numbers can be formed?

  • A
    $1261$
  • B
    $1262$
  • C
    $1263$
  • D
    $1260$

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