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Q the minimum number of 2 input NAND gates required to realize the bollean function f(A,B,C)= AB'C

 Plz how to appraoch  this type of question so it will use minimum no of gate??
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This is my approach . 

#edit

First Line in the image  I have writen
A NAND B = (A NAND  B ) NAND ( A NAND B )

It is actually
A AND B = (A NAND  B ) NAND ( A NAND B )

NOTE : When you get some function first check if you simplify using any of the laws .
Eg A+AB can be written as A( 1+B) = A

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GateAspirant999 asked Oct 11, 2016
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The truth table for the combinational circuit is shown below:What is the minimum number of two input NAND gates required to realize this logic circuit?