數學題目(Get formulas)

Question:
(try to get formulas)

In value=Out Value
1=2
2=5
N=?
3=a
In value=Out Value
1=2
2=5
N=?
3=b
Q:
1)two formulas → ( N=?)
2)3=a; 3=b; a≠b → ( a=? b=?)

P.S.
1)make sure ur formulas are really DIFFERENT
2)choosing one more In value ( I used 3), and putting that "In value" (3) in both tables
also, ur out values should be different in two formulas

Good Luck