The sum of the first n terms of an arithmetic progression is given by $S_n = 4n^2 + 3n$. What is the 9th term of the progression if the first term is 1 and the common difference is 6?
A. 49
B. 55
C. 61
D. 67
Answer:B
The sum of the first n terms of an arithmetic progression is given by $S_n = 4n^2 + 3n$. What is the 9th term of the progression if the first term is 1 and the common difference is 6?
A. 49 B. 55 C. 61 D. 67