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1. D 19,13,3,-11,-29 2. B -1,4,9,14,19 3. A an=5/2n-11/2;37 4. D an=an-1+2;a1=8 5. C 306 6. B -105/2 7. C 36 8. C -675 9. A (-28+3n) 10. D 114
1. D 42.5 2. A s9=9/2(2+26) 3. B 22.5 4. D 617.5 5. A 425.25
