43. Which of these sequences is/are not bounded? I: a, 1= (-1)", n 21 A. III only B. I only C. II only D. I and III only II: an 41 := Ja, +1 , a¡ = 1, n 2 1. III: a, := 73 + (-1)" E. None of the above.

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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.