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?​

Answer 1

Step-by-step explanation:

There will be 72 code which will have no confusion.