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[" If "a,b,c" are distinct positive real...

[" If "a,b,c" are distinct positive real numbers and "a^(2)+b^(2)+c^(2)=1," then "ab+bc+ca" is "],[[" (1) less than "1," (2) equal to "1],[" (3) greater than "1," (4) any real number "]]

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