546/780 < 52n/780 < 750/780
546 < 52n< 750
10.5<n< 14 11/26
(11+12+13+14)/4=50/4=12.5
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546/780 < 52n/780 < 750/780
546 < 52n< 750
10.5<n< 14 11/26
(11+12+13+14)/4=50/4=12.5