Write a possible explicit rule for the nth term of the sequence: 5, 10, 20, 40, 80, ...

asked Sep 23, 2017 147k views

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5, 10, 20, 40, 80, ...

$5, 5*2, 5*4, 5*8, 5*16, ... \\ \\5* 2^0, 5*2^1, 5*2^2, 5*2^3, 5*2^4, ... \\ \\a_n=5* 2^(n-1),n\in N$

Chilly Zhong answered Sep 30, 2017

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