Question

What is the formula for the nth term of a geometric sequence with a4 = 16 and r = `1/2`?

`a_(n)=16(1/2)^(n-1)`` `


`a_(n)=1/2(16)^(n-1)`


`a_(n)=128(1/2)^(n-1)`


`a_(n)=128(2)^(n-1)`