# Find a_7 if an=12(1/2)^n−1

Find ${a}_{7}$ if ${a}_{n}=12{\left(\frac{1}{2}\right)}^{n-1}$
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Amaya Vance
${a}_{n}=12{\left(\frac{1}{2}\right)}^{n-1}$
$⇒{a}_{7}=12{\left(\frac{1}{2}\right)}^{7-1}$
$⇒{a}_{7}=12\left(\frac{1}{64}\right)$
$⇒{a}_{7}=\frac{3}{16}$