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If a,b,c are in A.P., then `a^2(b+c)+b^2(c+a)+c^2(a+b)` is equal to

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If a,b,c are in A.P., then `a^2(b+c)+b^2(c+a)+c^2(a+b)` is equal to
A. `2/9(a+b+c)^3`
B. `1/8(a+b+c)^3`
C. `3/10(a+b+c)^3`
D. `((a+b+c)^3)/9`

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Correct Answer - A
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