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What does a(1) + a(2) + a(3) + …..+ a(n)...

What does `a_(1) + a_(2) + a_(3) + …..+ a_(n)` represent

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Write the first five terms of the sequences in obtain the corresponding series: a_(1)= a_(2)= 1, a_(n)= a_(n-1) + a_(n-2), n gt 2

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