The missing value in the following figure is
Question:
The missing value in the following figure is

Use the logic which gives answer in single digit
Solution:
$x=(2-1)^{1 !}=1$
$w=(12-8)^{4 !}=4^{24}$
$z=(7-4)^{3 !}=3^{6}$
hence $y=(5-3)^{2 !}=2^{2}$
