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Two elements \( X \) and \( Y \) form two compound \( X Y_{2} \) and \( X_{3} Y_{2} \cdot 0.1 \) mol of \( X Y_{2} \) weighs \( 10 \mathrm{~g} \) while \( 0.05 \mathrm{~mol} X_{3} Y_{2} \) weighs, \( 9 \mathrm{~g} \). Atomic masses of \( X \) and \( Y \) are :
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