Ответ:
S3=b1(1-q^3)/1-q
S3=5(1-4^3)/1-4
5(-63)/(-3)
S=5•21
S=105
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Ответ:
S3=b1(1-q^3)/1-q
S3=5(1-4^3)/1-4
5(-63)/(-3)
S=5•21
S=105