if a varies as b and b varies as c then prooved that (a^3+b^3+c^3) varies as 5abc
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a=bk
b=cl
aaa+bbb+ccc= c3k3l3 + c3l3+ c3
= c3(k3l3+l3+1) = C3 . Z
= cx b/lxa/lk.Z
= abc.Z/Y
= F. abc
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