Find the sum 3 + 6 + 9 + ...... + 90A1395B1935C1359D1953Answer: A. 1395Read Explanation:3 + 6 + 9 + ..... + 90 = 3(1 + 2 + 3 + ..... + 30) = 3(30×31/2) = 3(15 × 31) = 1395Open explanation in App