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A copper sample has been metallographically analysed for determining its mean grain size. It is found to have an ASTM grain size number of 5. The number of grains per mm2 in the sample will be

A copper sample has been metallographically analysed for determining its mean grain size. It is found to have an ASTM grain size number of 5. The number of grains per mm2 in the sample will be Correct Answer 248

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