Хелп!
Найдите число членов и их сумму для геометрической прогрессии:
а) 1, 5, ..., 78 125,
б) 2, 4, ..., [tex] 2^{n} [/tex],
в) 1, 3, ..., [tex] 3^{2n} [/tex],
г) -17, -289, ..., [tex] -17^{12k+1} [/tex],
д) 2, 4, ..., [tex] 2^{n-4} [/tex]
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