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" 4) If "a^(2)+b^(2)+c^(2)=250" and "ab+...

" 4) If "a^(2)+b^(2)+c^(2)=250" and "ab+bc+ca=3," find the value of "(a+b+c)

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(i) If a^(2)+b^(2)+c^(2)=20 " and" a+b+c=0, " find " ab+bc+ac . (ii) If a^(2)+b^(2)+c^(2)=250 " and" ab+bc+ca=3, " find" a+b+c . (iii) If a+b+c=11 and ab+bc+ca=25, then find the value of a^(3)+b^(3)+c^(3)-3 abc.

(i) If a^(2)+b^(2)+c^(2)=20 " and" a+b+c=0, " find " ab+bc+ac . (ii) If a^(2)+b^(2)+c^(2)=250 " and" ab+bc+ca=3, " find" a+b+c . (iii) If a+b+c=11 and ab+bc+ca=25, then find the value of a^(3)+b^(3)+c^(3)-3 abc.