Question

Find the sum 3 + 6 + 9 + ...... + 90

• A. 1395
• B. 1935
• C. 1359
• D. 1953

Answer 1

Answer:

A. 1395

3 + 6 + 9 + ..... + 90 = 3(1 + 2 + 3 + ..... + 30) = 3(30×31/2) = 3(15 × 31) = 1395