Vacational Dinner Alone
A person has six friends and during a certain vacation he met them during several dinners.He found that he dined with all the 6 exactly on one day,with every 5 of them on 2 days,with every 4 of them on 3 days,with every 3 on 4 days;with every 2 on 5 days.Further every friend was present at 7 dinners and every friend was absent at 7 dinners.The number of dinner(s) he had alone is equal to
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