16. a1=7, r=5 5, __,__,__ 17. a1=7, r=2 7,__,__,__
18. a1=10, r=10 10,__,__,__
19. a1=240, r=1/2 240__,_,_
20. a1=3, r=-1/3 3,__,__,__,

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