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The defining length and order of the schema 1***********1 is :

  • A.δ(H) = 13, O(H) = 02
  • B.δ(H) = 10, O(H) = 13
  • C.δ(H) = 12, O(H) = 2
  • D.δ(H) = 12, O(H) = 13

Answer: C

The defining length is 12 and the order is 2: δ(H) = 12, O(H) = 2.

The schema 1***********1 has 13 positions: a fixed 1 at position 1, eleven don't-care symbols (*), and a fixed 1 at position 13.

The order O(H) is the number of fixed positions, here 2. The defining length δ(H) is the distance between the first and last fixed positions, 13 - 1 = 12.

Option (A) gives the string length 13 as the defining length, and options (B) and (D) give 13 as the order, which counts every position instead of only the fixed ones.

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