question_answer

An intelligence agency forms a code of two distinct digits selected from 0, 1, 2,..., 9 such that the first digits 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?

A)  80                   

B)  78           

C)  71                   

D)  69