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zlopas [31]
3 years ago
11

Which formula can be used to find the nth term in a geometric sequence where a1=3 and r=2 ?

Mathematics
2 answers:
egoroff_w [7]3 years ago
8 0
1st term =a₁ = 3,  r=2

1st a₁   = 3 x 2⁰
2nd a₂  = 3 x 2¹
3rd a₃  =  3 x 2²
4th a₄   = 3 x 2³
5th a₅   = 3 x 2⁴
.......................
.......................
nth : a(n) = 3 x 2⁽ⁿ-¹)
Note when that the subscript of a is the same as the exponent mines 1
shusha [124]3 years ago
7 0
A(n)=a(1)*r^(n-1)

a(n)=3*2^(n-1)

Hope I don't mess up for your sake.
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