$${ 10 }^{ 31 } \div { 10 }^{ 61 }$$
$\frac{1}{1000000000000000000000000000000}= 10^{-30}$
$$\frac{1}{10^{30}}$$
$$\frac{1}{1000000000000000000000000000000}$$
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$\frac{1}{2 ^ {30} \cdot 5 ^ {30}} = 0.9999999999999998 \times 10^{-30}$