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5. Find the sum of the finite sequence an = 85 - 7n for 1 s n 5. 6. 7. Find the sum of the
5. Find the sum of the finite sequence an = 85 - 7n for 1 s n
5. 6. 7. Find the sum of the finite sequence an a. 320 b. 270 = 85 -7n for 1 s n < 5. c. 363 (2Yi4.z Find the sum of the finite sequence an = b. 302 15 forl < n 6. 15 Write the expression 3x + 6x2 + + + + 60x20 in sigma notation. C. Ei2_013nxn d. 355 15 3nxi
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