Answer:

8

Step-by-step explanation:

If a+b=2

so there are two possibilities

a=1, b=1

OR

a=2, b=0

if a=1,b=1

then 1×1×1+1×1×1+6×1×1 = 8

if a=2 , b=0

then, 2×2×2+0×0×0+6×2×0= 8+0+0= 8

In every condition the answer is 8 only.