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https://gateoverflow.in/2314/gate1993-17

NOT GETTING THE SOLUTION  FROM HERE .........................

Now, these include the no. of persons who eat all 3 items thrice. So, excluding those, we get, no. of persons who eat at least two items (by adding the no. of persons eating EXACTLY 2 dishes and the number of persons eating all 3 dishes) as

31−Y−2∗5=21−Y31−Y−2∗5=21−Y.

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