Use the formula for the sum of a geometric series to calculate the given sum. (Express numbers in exact form. Use symbolic notation and fractions where needed. Enter DNE if the series diverges.) 72 73 74 A 75 7 + ... = 123 * 126 Use the formula for the sum of a geometric series to find the sum. (Use symbolic notation and fractions where needed. Enter DNE if the series diverges.) 3 C 19 t 4 - t + - + .. = DNE 934