Find 5th term in the series 5, 15, 45, -----
155
215
175
405
$a=5, \quad r=155=3, \quad n=5$ $5^{\mathrm{th}}$ term, $\mathrm{t}_5=\mathrm{ar}^{\mathrm{n}-1}=5 \times 3^{2-1}=5 \times 3^4=5 \times 81=405$
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