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The series 33-3=24 43-4=60 . 63-6=210 83-8=504 123-12=1716 143-14=2730 243-24=13800 223-22=10626 4,8,14,22-series--4=12+3 8=22+4 14=32+5 22=42+6 3,6,12,24----with common ratio 2 The series 33-3=24 43-4=60 . 63-6=210 83-8=504 123-12=1716 143-14=2730 243-24=13800 223-22=10626 1st series 4,8,14,22-series 4=12+3 8=22+4 14=32+5 22=42+6 2nd series 3,6,12,24----with common ratio 2