4. The function t:Z15 → Z15 is defined as t(r) = 3r – 5 (mod 15). (a) Find t({2,3, 5, 13}). (b) Find t-"({1,5,7}). (c) Find im t.

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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.