If a specific person is always selected, then there will be no total selection left as per the question. If the person is never selected, then he will be removed from all numbers. Total persons = 12-2= 10 People to be selected = 10C4 =10 ! / (10-4)! ×4! =10 ! /6! ×4! =10×9×8×7×6!)/4! ×6! =10×9×8×7)/4×3×2 =10×3×7=210.
Operating Profit Margin is calculated by
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