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CAT 2003 | Question: 2-90

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An intelligence agency forms a code of two distinct digits selected from $0, 1, 2, \dots 9$ such that the first digit of the code is nonzero. The code, handwritten on a slip, can however potentially create confusion, when read upside down – for example, the code $91$ may appear as $16.$ How many codes are there for which no such confusion can arise?

  1. $80$
  2. $78$
  3. $71$
  4. $69$

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