Three out of six look alike balls are heavy. Identify the heavy balls by three times weighing on a beam balance!
Answer:
Number the balls: 1, 2, ..., 6. Then weigh (No. 1, No. 2) vs (No. 4, No. 5), next weigh (No. 2, No. 3) vs (No. 5, No. 6), and then (No. 3, No. 1) vs (No. 6, No. 4).
Answer:
Number the balls: 1, 2, ..., 6. Then weigh (No. 1, No. 2) vs (No. 4, No. 5), next weigh (No. 2, No. 3) vs (No. 5, No. 6), and then (No. 3, No. 1) vs (No. 6, No. 4).
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