What will come in place of question mark (?) in the given questions ?
$$\sqrt{729} \div 45 \times 540 = ?^{2}$$
Expression : $$\sqrt{729} \div 45 \times 540 = ?^{2}$$
=> $$27 \times \frac{1}{45} \times 540 = (x)^2$$
=> $$27 \times 12 = (x)^2$$
=> $$(x)^2 = 324$$
=> $$x = \sqrt{324} = 18$$
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