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24-01-2019
Mathematics

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Write the first 3 numbers of the sequence. an=a1r^n-1 an=2(3)^n-1

Respuesta :

28-01-2019

Answer:

2, 6, 18

Step-by-step explanation:

[tex]a_n=2(3)^{n-1}\\\\\text{Put n = 1, n = 2 and n = 3 to the equation:}\\\\a_1=2(3)^{1-1}=2(3)^0=2(1)=2\\\\a_2=2(3)^{2-1}=2(3)^1=2(3)=6\\\\a_3=2(3)^{3-1}=2(3)^2=2(9)=18[/tex]

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