Use the formula for the sum of a geometric sequence to write the following sum in closed form. Here, n > 5 is an integer. Please pay attention to which terms are present in the sum. 1 + 22 (-1)" ..+ 1...

Extracted text: Use the formula for the sum of a geometric sequence to write the following sum in closed form. Here, n > 5 is an integer. Please pay attention to which terms are present in the sum. 1 + 22 (-1)" ..+ 1 1 1 1 24 25 26 27 2n