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 hand written on a slip, can however potentially create confusion, when read upside down for example, the code 91 may appear as 16. Let N be the number of codes for which no such confusion can arise. Find sum of digits of N.
Answer:
what is your question bro
please explain the question