IC 7402 is different from the other type of IC like 7404,7408,7432 and 7400 when it is connected to have an output desired... if you noticed all i mentioned ic is connected from left to the right.
input pin 1 and 2, output pin 3
input pin 4 and 5, output pin 6
input pin 13 and 12, output pin 11
input pin 10 and 9, output pin 8
while in nor gate, to have the desired output it must be connected from right to left...
input pin 2 and 3, output pin 1
input pin 5 and 6, output pin 4
input pin 8 and 9, output pin 10
input pin 11 and 12, output pin 13
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