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$\small\underbrace{3333\dots33}_{nÓ3}\times\underbrace{3333\dots34}_{(n-1)Ó3} =\small\underbrace{1111\dots11}_{nÓ1}\underbrace{2222\dots22}_{nÓ2}$
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$\large\frac{1}{2}+\frac{2}{4}+\frac{3}{8}+\frac{4}{16}+\frac{5}{32}+$ ........ = ?
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