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If a ,b ,c ,d in R^+ such that a+b+c=18...

If `a ,b ,c ,d in R^+` such that `a+b+c=18` , then the maximum value of `a^2b^3c^4` is equal to a. `2^(18)xx3^2` b. `2^(18)xx3^3` c. `2^(19)xx3^2` d. `2^(19)xx3^3`

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