Solution
Expression : $$\sqrt{1-\frac{x}{324}}=\frac{13}{18}$$
=> $$\sqrt{\frac{324-x}{324}}=\frac{13}{18}$$
=> $$\frac{324-x}{324}=(\frac{13}{18})^2$$
=> $$\frac{324-x}{324}=\frac{169}{324}$$
=> $$324-x=169$$
=> $$x=324-169=155$$
=> Ans - (A)
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