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50b^(2)c^(2)-58a^(2)...

50b^(2)c^(2)-58a^(2)

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If 8a^(2)+50b^(2)+98c^(2)-20ab-70bc-28ac=0 then show that 2a=5b=7c

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If a^(2)+b^(2)+c^(2)=50andab+bc+ca=47 , find the value of a+b+c .

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If t_(n) denotes the nth term of the series 2+3+6+11+18+... then t_(50)49^(2)-1b .49^(2)c.50^(2)+1d*49^(2)+2