[tex]\displaystyle\bf\\b_{1} =8\\\\q=2\\\\\\b_{4}=b_{1} \cdot q^{3} =8\cdot 2^{3} =8\cdot 8=64\\\\\\Otvet: \ b_{4} =64[/tex]
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[tex]\displaystyle\bf\\b_{1} =8\\\\q=2\\\\\\b_{4}=b_{1} \cdot q^{3} =8\cdot 2^{3} =8\cdot 8=64\\\\\\Otvet: \ b_{4} =64[/tex]