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You have 6 friends, dined with all '6' i...

You have 6 friends, dined with all '6' in one day, with every 5 in 2 days, with every 4 in 3 days, with every 3 in 4 days with every 2 in 5 days. Further every friend was present in 7 days and absent in 7 days. How many dinners you have alone?

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