It's 4 and u should know that by now.
Fun fact
if f(a)=b then f⁻¹(b)=a
so
if f⁻¹(b)=a then f(a)=b
so we find f(x)=27 and the solve for x
f(x)=3x=27
3x=27
divide both sides by 3
x=9
so if f(9)=27 then f⁻¹(27)=9
problem solved
answer is 9
42 = 2 * 3 * 7
So, <span>the combination for the lock is 237</span>
I got 67 but I can guarantee it’s right
