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Because if input A *and* input B is true, then the output is true!

Truth table of AND gate:

┌─┬─╥───────┐

│A│B║Q (Output)│

├─┼─╫───────┤

│0│0║0..............│

├─┼─╫───────┤

│0│1║0............. │

├─┼─╫───────┤

│1│0║0............. │

├─┼─╫───────┤

│1│1║1............. │

└─┴─╨───────┘

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