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3. In a geometric sequence the 4th term is 48 and the 6th term is 192. a. Use the process described in the textbook to
3. In a geometric sequence the 4th term is 48 and the 6th term is 192.
a. Use the process described in the textbook to calculate the values of a and r.
b. Use the formula for sum to calculate the sum of the first 20 terms
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