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# Two elements $X$ and $Y$ have atomic mass 75 and 16 respectively.They combine to give a compound having 75.8%X.The formula is

$\begin{array}{1 1}(a)\;XY&(b)\;X_2Y\\(c)\;X_2Y_2&(d)\;X_2Y_3\end{array}$

$\therefore$ Formula=$X_2Y_3$
Hence (d) is the correct answer.