Verify the property: 
by taking:
(i) 
(ii) 
(iii) 
(iv) 
(i) We have,
x = 
, y = 
and z = 
x * (y * z) = 
* (
* 
)
= 
(
)
= 
(x * y) * z = (
* 
) * 
= 
(
)
= 
(ii) We have,
x =0, y = 
and z = 
x * (y * z) = 0 * (
* 
)
= 0
(x * y) * z = (0* 
) * 
= 0
(iii) We have,
x = 
, y = 
and z = 
x * (y * z) = 
* (
* 
)
= 
(
)
= 
(x * y) * z = (
* 
) * 
= 
(
)
= 
(iv) We have,
x = 
, y = 
and z = 
x * (y * z) = 
* (
* 
)
= 
(x * y) * z = (
* 
) * 
= 
(
)
= 
2