What is the nth term of arithmetic sequence 3 7 11 15?
A
4n-1
B
4n+1
C
3n+1
D
2n+3
Correct Answer: Option A — 4n-1
Explanation:
First term a=3 common difference d=4. nth term = a+(n-1)d = 3+4(n-1) = 4n-1. Verification: n=1→3 n=2→7 n=3→11 confirms correctness. Finding nth term formulas for arithmetic sequences is essential for sequences and series questions in competitive exams and is also used in salary progression and installment problems.