Patterns for 2
2^1 = 2
2^2 = 4
2^3 = 8
2^4 = 16 and repeats so 857 mod 4 = 1 so 2^857 ends in "2"
Patterns for 3
3^1 = 3
3^2 = 9
3^3 = 27
3^4 = 81 and repeats so 927 mod 4 = 3 so 3&927 ends in "7"
So 2^857+3^927 ends in 2 + 7 = 9
And 2^857*3^927 ends in (2) (7) = 4
+234 
