will you explain in this pdf question which am I select more?

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Jul 16, 2014, 4:15:15 PM7/16/14

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lesson9-2.6.pdf

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Jul 16, 2014, 4:39:58 PM7/16/14

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SUM function takes only numeric variables as input and thus it is not correct way.

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Jul 16, 2014, 11:05:25 PM7/16/14

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all the options are right except SUM, as sum function only takes numeric variable as its parameter.

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