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Question Number 136331 by mohammad17 last updated on 20/Mar/21

Answered by mr W last updated on 20/Mar/21

5×3^(n+1) ×2^(1−2n) =5×3^n ×3×2×4^(−n) =30×((3/4))^n Σ_(n=2) ^∞ 30×((3/4))^n =30×((3/4))^2 (1/(1−(3/4)))=67.5

5×3n+1×21−2n=5×3n×3×2×4−nMissing \left or extra \rightMissing \left or extra \right

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