HELP with logic question (electronics)

[Limitedrichy]

I have a question that needs answering Logic based.

 

I need to make a circuit that has 3 inputs (A.B,C) and 1 output

It can only use 3 gates ,Nand only Doesnt matter how many the inputs the nand has. 

 

Output is high when:

A and B are high or

C is high

Only b is high

 

Calculated a truth table for it but cant make the circuit. Can anyone help me? 

 

[LawrenceBarnes2013]

try to explain it better with no lines skimping

[Limitedrichy]

i don't really know how to   just need to make a circuit which gives the desired function Output is high when: A and B are high or C is high or Only b is high by using 3 gates thats it.

[colonel_mortis]

I think this will work for you:

Either of them will work, but the 2nd is kinda cheating because you should OR the output.

I know the 1st uses 4 gates, but you can't do it like that with 3 NAND gates (unless I'm missing something)

[Limitedrichy]

Cheers man  will check tomorrow to see if it works .Can do jk flip flops and 8 bit counters just couldn't get my head round this thanks  

[colonel_mortis]

Cheers man  will check tomorrow to see if it works .Can do jk flip flops and 8 bit counters just couldn't get my head round this thanks

By the way, while you said it needs to react to B on its own, if either A or C are pressed as well as B, it will go high anyway so it doesn't matter.

I have updated my original post because I realised an error: