CAT Quant Practice Problems

Question: An intelligence agency forms a code of two distinct digits selected from 0, 1, 2, …, 9 such that the first digit of the code is non-zero. 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

Correct Option:3

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CAT Quant Practice Problems
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