What Is The Sum Of The First 12 Term Of An A.P Whose First Time Is 15 And The Common Difference

Answer 1

incomplete

sum(12) = 6(30 + 11d)
= .....

Once you have established what the common difference d is in your question, you can finish the question.

Answer 2

The answer

Answer 3

What is the sum of 6 term of an AP whose first term is 15 and common difference is 13