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21) p/a+q/b+r/c=1 and a/p+b/q+c/r=0 Where a, b, c are non-zero, then p^2/a^2 +q^2/b^2 +r^2/c^2 is

p/a+q/b+r/c=1 and  a/p+b/q+c/r=0 Where a, b, c are non-zero, then p^2/a^2 +q^2/b^2 +r^2/c^2  is Watch video to see the solution :                                  
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