Question: If a 1 , a 2 , . . . , an + 1 in { 1 , 2 , . . . , 2

If a1, a2,..., an+1 in {1,2,...,2n} are distinct, then there exist i, j, i 6= j, such
that ai divides aj .(This was one of Erdos favourite question to ask an \epsi .)

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