$$3 \div 7 \div 3 \div 7=$$
$\frac{1}{49}\approx 0.020408163$
$$\frac{\frac{3}{7}}{3\times 7}$$
$$\frac{\frac{3}{7}}{21}$$
$$\frac{3}{7\times 21}$$
$$\frac{3}{147}$$
$$\frac{1}{49}$$
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$\frac{1}{7 ^ {2}} = 0.02040816326530612$
