Find the sum of the first 20 terms of the arithmetic sequence 3,6,9,12,...​

Answer:60Step-by-step explanation:since the common difference is 3 we will have to add 3 in each number that is given 3,6,9,12,15,18,21,24,27,30,33,36,39,42,45,48,51,54,57,60 this is the slow way but you can never get the answer wrong if you use this method

Answered by kingdough111 | 2024-09-05