Hard
Find the 23th term of the AP: -3, 1, 5, ...
Explanation
Explanation
The nth term of an AP is aₙ = a + (n-1)d, where a = -3 (first term) and d = 4 (common difference). So the 23th term = -3 + (23-1)(4) = -3 + 88 = 85.
PRO TIP
Re-check your working by substituting the answer back into the original question.