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Find-the-nth-term-of-the-sequence-5-5-35-65-275-




Question Number 49427 by Tawa1 last updated on 06/Dec/18
Find the nth term of the sequence:   5,  5,  35,  65,  275, ...
$$\mathrm{Find}\:\mathrm{the}\:\mathrm{nth}\:\mathrm{term}\:\mathrm{of}\:\mathrm{the}\:\mathrm{sequence}:\:\:\:\mathrm{5},\:\:\mathrm{5},\:\:\mathrm{35},\:\:\mathrm{65},\:\:\mathrm{275},\:… \\ $$
Commented by Tawa1 last updated on 07/Dec/18
Answer:     3^n  − (− 2)^n  .    How ???
$$\mathrm{Answer}:\:\:\:\:\:\mathrm{3}^{\boldsymbol{\mathrm{n}}} \:−\:\left(−\:\mathrm{2}\right)^{\boldsymbol{\mathrm{n}}} \:.\:\:\:\:\mathrm{How}\:??? \\ $$

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