The puzzle that 'knocked out' all 4 contestants of Road to Olympia - Lang Son Newspaper and Radio and Television Station

In the Finish Line contest of male student Hoang Khanh, a question worth 30 points appeared with the following content: "Mr. Dung has 12 natural numbers from 1 to 12, he needs to divide them into 2 groups A and B, so that the sum of the numbers in each group is equal to the remaining group and group A has the smallest number of numbers possible. What is the smallest number of A? Then, which natural numbers are in group A?"

After thinking for a short time, Hoang Khanh could not give an answer to this question. Immediately after that, the opportunity was given to the remaining 3 contestants but no one rang the bell to answer because this question was too difficult.

The puzzle that 'knocked out' all 4 contestants of Road to Olympia

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Source: https://baolangson.vn/cau-do-danh-guc-ca-4-thi-sinh-duong-len-dinh-olympia-5043790.html