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# In the grain -size determination using standard charts, the relation between the given size number n and the average number of grains 'N' per square inch at a magnification of 100 X isa)N = 2n  b)N = 2n-1c)N = 2n + 1  d)N = 2n + 1   Correct answer is option 'B'. Can you explain this answer? Related Test: Metal Casting - MCQ Test 1

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