5 + 10 + 15 + .... + 100 എത്ര ?A1000B1100C1050D1200Answer: C. 1050 Read Explanation: 5 + 10 + 15 + .... + 100 = 5(1 + 2 + 3 + ......... + 20) = 5( 20 × 21/2) = 5(210) = 1050Read more in App