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Solution
$$3214_{(7)}$$ = $$4\left(7^0\right)+1\left(7\right)+2\left(7^2\right)+3\left(7^3\right)=\ 1138$$
$$\therefore\ $$In decimal system, $$3214_{(7)}$$ = $$1138_{(10)}$$
Hence, the correct answer is Option A
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