The AND or E function is characterized by the truth table shown next to the figure that is “opposite” to that of the NAND function, which is negative. We can say that, for this function, the output will be 1, when one input AND other inputs are at level 1. For any other condition, the output will be 0. Since the NAND function is the negative of the AND function, we can use one of the 4011's own gates (which has 4) in normal condition, such as NAND and another to “invert” the results, thus negating the function that takes us back to the AND function. So, we have to: Inverter + nand = and.
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