Mathematics, 10.02.2022 14:00 genyjoannerubiera

if the nth term of a series 18, 36, 64,... is given as 5r^n+bn, find an expression for the sum of the first nth terms

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if the nth term of a series 18, 36, 64,... is given as 5r^n+bn, find an expression for the sum of th...