210, 140, 105, 84, 70, 63, 52.5
210 X (2/3) = 140 140 X (3/4) = 105 105 X (4/5) = 84 84 X (5/6) = 70 70 X (6/7) = 60 60 X (7/8) = 52.5 Therefore, '60' should come in place of '63'.
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