Mathematics
Let \(a,ar,ar^{2},\ldots\) be an infinite G.P. If
\(\sum_{n = 0}^{\infty}\mspace{2mu} ar^{n} = 57\) and
\(\sum_{n = 0}^{\infty}\mspace{2mu} a^{3}r^{3n} = 9747\), then
\(a + 18r\) is equal to
A
38
B
46
C
27
D
31
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