Multiple choice The sum of series 8, 4, 0 ... to 50 terms is 18,900 9,000 4,500 none of these Reveal answer Fill a bubble to check yourself C Correct answer Explanation Arithmetic progression with a=8, d=-4, n=50. Sum = (n/2) * [2a + (n-1)d] = (50/2) * [16 + 49(-4)] = 25 * [16 - 196] = 25 * (-180) = -4500.