Question Number: #Com6321

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 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?

A.) 80
B.) 78
C.) 71
D.) 69

Answer is option : C

Question Related Topics:
Quantitative Ability
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