Hi guys, this is my first time and i haven't read the rules, sorry if there is anything wrong about my post
i just want to ask about Logic Gates!!
My teacher gave us a quiz about this logic gate, and I'm confused about this variables!!

CD and CD'

are they the same? or not?

by the way, this is the logic gate that our teacher gave to us >> {A+[B(CD')]}+E << Thank you

 

Do you understand what the apostrophe means in CD' ?

 

Do you understand what the apostrophe means in CD' ?

Yes in our study, we use it as a symbol for the logic gate NOT or INVERTER

 

So if you do truth tables for CD and for CD' you will be able to see whether they are the same or not.

 

CD x CD' = C x (D x D')

And what is D x D'?

 

AND function is true if. and only if, all the inputs are true.

 

CD x CD' = C x (D x D')

And what is D x D'?

I don't think the OP meant AND, but simply "and". As in compare CD and CD' or in other words compare CD to CD' and determine if they are equal.

 

Thank you for all the reply's guys.. but i only need to know if there the same.. FROM YOUR OPINIONS!! .. i dont need to do truth table.. i just want to know if they are the same

 

Thank you for all the reply's guys.. but i only need to know if there the same.. FROM YOUR OPINIONS!! .. i dont need to do truth table.. i just want to know if they are the same

Ah, I see. You don't want to understand whether or not they are the same or to make any attempt to figure out whether they are the same, you just want to take an opinion poll of what other people think and that's all the more effort you feel you need to put in.

But, I guess that is quite consistent with not feeling any need to read the rules you agreed to when you joined.

 

CD
00
01
10
11 True

CD'
00
01
10 True
11

Are the above tables identical?

 

Thank you for all the reply's guys.. but i only need to know if there the same.. FROM YOUR OPINIONS!! .. i dont need to do truth table.. i just want to know if they are the same

Opinions are like elbows -- everybody has one. If our opinion was that you should fall down and cripple yourself -- would you?

 

Thank you for all the reply's guys.. but i only need to know if there the same.. FROM YOUR OPINIONS!! .. i dont need to do truth table.. i just want to know if they are the same

Are you aware of the ability to express your question as a poll? That way, I could submit your question to Watter's World and give you the definitive polled result. I think the definitive answer would be huh? (option #3)

John

 

CD xor CD' = C x (D xor D')

And by definition, D xor D' = ?

Done.

 

General rule of thumb in symbolic logic. If two things are not syntactically the same, they cannot be semantically the same.

 

Opinions are like elbows -- everybody has one.

Opinions are like elbows - most people have more than one.

 

oh my god, I'm sorry guys but there has been a Type ERROR!!..

i mean CD' and (CD)'

Aw... This is what I mean... tsk not this one > CD and CD' < SORRY GUYS!! there is some mistake, and I just make you guys a little bit confused sorry .. thank you anyways

 

oh my god, I'm sorry guys but there has been a Type ERROR!!..

i mean CD' and (CD)'

Aw... This is what I mean... tsk not this one > CD and CD' < SORRY GUYS!! there is some mistake, and I just make you guys a little bit confused sorry .. thank you anyways

Is there ANY chance that you're now willing to actually make some effort to try to answer your own question by doing a truth table for both of those and comparing them?

 

I think where your getting confused is that you see both CD together in both propositions, however use algebraic rules for parenthesis, that should help.