Please show work step by step

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 4. Check your answers for #3 by writing a Python program to calculate and print each of the 20 terms of the sequence. Your program should use a for loop to calculate each term and the sum of these terms. Your program should also calculate the value of the sum that is generated by using the formula for the sum of a geometric sequence. The program should compare the two sums and print both sums and your conclusion about the comparison. Paste a screenshot of the Python code and the output into your document