find the closed formula for each of the following sequences (a^n)n≥1 by relating them to a well known sequences. assume the first term given is a^1. a. 4,7,12,19,28,.... a^n=_________ b. -1,1,4,8,13,..... a^n=__________ c. 11,18,27,38,51,..... a^n=_________ d. 3,3,4,8,26 a^n=___________

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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.