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What will come in the place of '*'?
$$\frac{18}{*} = \frac{2}{7}$$
$$\frac{18}{*} = \frac{2}{7}$$
consider * = x
$$\frac{18}{x} = \frac{2}{7}$$
by doing cross multiplication,
$$18\times 7 =2\times x$$
$$x=63$$
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