If the nuclei of masses $X$ and $Y$ are fused together to form a nucleus of mass $m$ and some energy is released, then

X + Y = m

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X + Y < m

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X + Y > m

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X - Y = m

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Solution

The correct option is B $X + Y > m$
Since some energy is released, so one part of total mass of reactants is converted into energy
Therefore, total mass of reactants
$X + Y$
is more than the mass of nucleus ( $m$ )
So, we get $X + Y > m$

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