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| 1. |
An intelligence agency forms a code of two distinct digits selected from 0, 1, 2, ..., 9 such that the firstdigit of code is non-zero. The code, handwritten on a slip, can however potentially create confusion when read upside down, for examples the code 91 may appear as 16. How many codes are there for which nosuch confusion can arise? |
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Answer» 80 |
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