Finding the sum of a sequence

Questions (2)

Find the sum of the first n terms of the sequence. The sequences are either arithmetic or geometric.13. -1, 11, -121, ...; n = 9
1. 3 answers
2. asked by Brock
3. 471 views
If the nth term of a sequence is u1,u2,u3...,is 2n-1,find the sum of it's first eight terms
1. 3 answers
2. asked anonymously
3. 16 views

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