Question
In Questions to replace $‘?’$ with appropriate fraction.

Answer

Given sequence is $\frac{7}{8},\frac{7}{24},\frac{7}{72},\frac{7}{216},?.$
We observe that each fraction is divided by $3$ to get next fraction.
So, $?=\frac{7}{216}+3=\frac{7}{216}\times\frac{1}{3}=\frac{7}{648}$

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