can we find the value of gcd(x c y , z) easily and very fast using a computer.

where

1. "c" represents "combinations" used in 'permutations and combinations'.

2. x is very very large number (ex: may be of 100 or 1000 numerical digits)

3. y is also large having 2 to 5 digits less than x.

4. z is also large having the same number of digits as x.