CAT Quantitative Ability Questions | CAT Permutation, Combination and Probability questions
CAT/2003
Question . 34
An intelligence agency forms a code of two distinct digits selected from 0, 1, 2, ............ , 9 such that the first digit of the code isnonzero. The code, handwritten on a slip, can however potentially create confusion when read upside down –– for example, thecode 91 may appear as 16. How many codes are there for which no such confusion can arise?
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