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# Which of the statement about NOT gate is true?

(a)NOT gate can be used only after OR and XOR gates

(b)NOT gate and NOR gate produce same results

(c) NOT gates usually have 1 input and 2 output

(d)A small circle at end of a gate represents a NOT gate

A small circle at end of gate represents NOT gate all other statements are false.
Hence d is the correct answer.