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23 January, 14:54

What is the explicit formula for this geometric sequence? 5,10,20,40,80,160, ...

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  1. 23 January, 16:37
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    an = 5·2^ (n-1)

    Step-by-step explanation:

    The explicit formula for a geometric sequence with first term a1 and common ratio r is ...

    an = a1·r^ (n-1)

    Your sequence has a1=5 and r=2, so the explicit formula is ...

    an = 5·2^ (n-1)
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