Question Detail
Question
The 12th term of an AP is 34 and the 20th term is 58. Find the first term.
Correct Answer
Option A is the correct answer.
Detailed Explanation
t_12 = a + 11d = 34, t_20 = a + 19d = 58 → 19d−11d = 58−34 → 8d=24 → d=3. a + 11×3=34 → a=34−33=1.
Hint
Use t_n = a + (n−1)d for two equations.