The following are equivalent in a Boolean algebra: (1)a+b=b, (2)a*b=a, (3)a'+b=1, (4)a*b'=0 i. Prove the equivalence of (1) and (2) .

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A: That's easy.

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Sequence and Series

A sequence is defined as a collection of things. Series is defined to sum the things one by one in the sequence.  It was invented by German mathematician Carl Friedrich Gauss.