Description of the illustration maxfirst.gif
Maximum Method Followed by Sum Method: This diagram shows the following calculations in a grid format:
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Column 1: Maximum of {4, 1, 2} is 4
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Column 2: Maximum of {4, 8, 3} is 8
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Column 3: Maximum of {na, 6, 7} is 7
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Row 1: 4+4+na=8
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Row 2: 1+8+6=15
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Row 3: 2+3+7=12
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Row 4 (aggregates from Maximum): 4+8+7=19