সঠিক উত্তর হচ্ছে: A.A= 0
ব্যাখ্যা: বুলিয়ান উপপাদ্য (Boolean Theorems)______\r\n01. \r\nA + 0 = A \r\nA . 1 = A\r\n_________________\r\n02. \r\n$$A+\\overline{A} = 1$$ \r\n$$A.\\overline{A} = 0$$\r\n_________________\r\n03. \r\nA + A = A \r\nA . A = A \r\n_________________\r\n04. \r\nA + 1 = 1 \r\nA . 0 = 0