A party is attended by twenty people. In any subset of four people, there is at least one person who knows the other three (we assume that if x knows y , then y knows x). Suppose there are three people in the party who do not know each other. How many people in the party know everyone?
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5 people is the answer
as in question in any subset of 4 people
there is one person who knows each other so
twenty people attended
5 groups must be
hope it helps
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prakharsri:
Answer is 17
It's a logical question
That 3 peoples do not know each other but rest 17 people know each other as per the given condition!!
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