Erm......lol......Help

Barewolf · 07-09-2007, 17:34

Ok......

There must be some geniouses out there that can help me, I am having a bit of a headache with this god damn question, I don't understand it at all and even though I am allowed to skip the question its got me baffled to the point where I need to know what the hell it is.

Consider the following compound condition:

X AND (Y OR X) Which of the following is equivalent to it? (Select one option.) (Hint: you will probably have to draw a truth table to find the answer to this question.)

A X
B (X AND Y) OR Y
C Y
D (X OR Y) AND Y

I Assume this is maths? All i know is its something to do with Data as thats what my course is about.

Any Ideas?

---------- Post added at 17:34 ---------- Previous post was at 17:33 ----------

Ahhh - PS - If its a truth table it's Javascript I think.

monkey2468 · 07-09-2007, 18:00

It would be A just x as x is all you need and must have to get an output. (I think, it been a while) you will get no output with y unless you have x.

Barewolf · 07-09-2007, 18:12

so you cant have x and y together?

Cobbydaler · 07-09-2007, 18:16

What monkey2468 said...

Code:

X    Y    X AND Y
0    0       0
0    1       0
1    0       0
1    1       1

X    Y     Y OR X
0    0       0
0    1       1
1    0       1
1    1       1

X=0 Y=0
Y OR X = 0 X AND (Y OR X) = 0

X=0 Y=1
Y OR X = 1 X AND (Y OR X) = 0

X=1 Y=1
Y OR X = 1 X AND (Y OR X) = 1

X=1 Y=0
Y OR X = 1 X AND (Y OR X) = 1

monkey2468 · 07-09-2007, 18:19

Yes you can but its the same as having just x without x you get no output. The output only follows x so y is useless and has no influence on the output.

Truth table

x y output
0 0 0
0 1 0
1 0 1
1 1 1

So it is the same as just having x on its own.

Barewolf · 07-09-2007, 18:24

Ahh ok, thanks, I hate this course lol.

Tinky · 07-09-2007, 20:30

Quote:

Originally Posted by Barewolf

Ahh ok, thanks, I hate this course lol.

I can't think y!

dilligaf1701 · 07-09-2007, 20:32

Quote:

Originally Posted by Barewolf

Ahh ok, thanks, I hate this course lol.

I wouldn't worry about it, 'imagination is more important than knowledge' right

Sirius · 07-09-2007, 20:45

Quote:

Originally Posted by Jefferson T

I wouldn't worry about it, 'imagination is more important than knowledge' right

Say that to the heart surgeon about to do your triple bypass or the pilot landing that jumbo

LSainsbury · 07-09-2007, 21:06

Quote:

Originally Posted by Tinky

I can't think y!

skyblueheroes · 07-09-2007, 21:21

A better thread title might have helped.

Raistlin · 07-09-2007, 22:22

Yeah, the OU seem to have a thing about truth tables don't they?

**Hugh** · 07-09-2007, 22:48

Quote:

Originally Posted by Raistlin

Yeah, the OU seem to have a thing about truth tables don't they?

Never knowingly up-to-date, are the OU?

I did my OU MSc Computing in Business in the mid-90's, and the OS you had to discuss/answer questions on was CP/M.

greencreeper · 07-09-2007, 23:01

Boolean alegbra

Takes me back. You'll never use it, so don't worry about it.

Sirius · 07-09-2007, 23:06

Quote:

Originally Posted by foreverwar

Never knowingly up-to-date, are the OU?

I did my OU MSc Computing in Business in the mid-90's, and the OS you had to discuss/answer questions on was CP/M.

As good as Vista then