Verified Answer :

crisforp

We have a4 = a1 q^3;
Then, 16 = a1   (1/8);
a1 = 128;
The formula for the nth term of a geometric sequence is an = a1 q^n;
an = 128 (1/2)^n = (2^7)/(2^n) = 2^(7-n);

Answer:

here is the answer

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