Hi

Can anyone expalin to me how

x'y'z' + x'yz' + xyz'

= x'z' + yz'

I can only reach this:

x'y'z' + x'yz' + xyz'

=(y'+y)x'z' + xyz'

=x'z' + xyz'

where do I go next?

Thanks for your time.

EDIT:

Can you repeat an expression from the original equation

i.e. in the equation x'y'z' + x'yz' + xyz' (there are 3 xyz variables)

if I use

x'y'z' + x'yz' = (y+y')x'z' = x'z'

x'yz' + xyz' = (x+x')yz' = yz'

then

result = x'z' + yz'

is this ok?