4, a=2, r=0.5, S∞=?, 3, a=?, r=0.6, S∞=7.5, 0.75, S∞=24, a=6, r=?, 0.5, a=4, r=?, S∞=8, 7.5, a=12, r=-0.5, S₅=?, 10.4, a=?, r=0.2, S₆=12.

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