What should come in place of the question mark (?) in the following questions ?
Expression : 13/63 $$\div$$ 104/14 $$\times$$ 52/19
= $$\frac{13}{63} \div \frac{104}{14} \times \frac{52}{19}$$
= $$\frac{13}{63} \times \frac{14}{104} \times \frac{52}{19}$$
= $$\frac{13}{9} \times \frac{1}{19} = \frac{13}{171}$$
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