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The answer to each of the following questions is a single digit integer from 0 to 9. If the correct answer to the question number A,B, C and D say 3,0,8,5 respectively, then the correct darkening of bubbles should be as follow. Amonst the following, the total number of ores, which can be concentrated by from floatation process haematite, bauxite, galena, copper pyrites, sphalerite caneterite, calamine, argentite, chalcorite. |
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