Two functions Diff(N) and Sum(N) are defined as follows

Diff(N) takes a non-negative integer N as a parameter and returns the difference of N and the number obtained by reversing the digit/digits of N.

Sum(N) takes a non-negative integer N as a parameter and returns the sum of N and the number obtained by reversing the digit/digits of N.

For a two digit natural number Y with distinct digits, a set of five non-negative integers {A, B, C, D, E} is defined such that

A = Diff(Y);      B = Diff(A);

C = Diff(B);      D = Diff(C);

E = Diff(D);      F = Diff(E);

Q1. If E is not equal to zero, what is Y?
a. 86                   b. 76                 c. 90                        d. Cannot be determined

Q2. If Y is greater than 50, what is F?
a. 0                    b. 9                        c. 27                      d. None of these

Q3. If Sum(A) = Sum (B) = Sum(C) = K and K > Sum (D) , what could be the value of A?
a. 18                   b. 27                    c. 36                     d. 58