Easy
In an AP, the first term is 10 and the common difference is -3. Which term of the AP is -2?
Explanation
Explanation
Using aₙ = a + (n-1)d, set a + (n-1)d = -2: 10 + (n-1)(-3) = -2. Solving, (n-1) = (-2 - 10)/-3 = 4, so n = 5. Thus -2 is the 5th term.
PRO TIP
Re-check your working by substituting the answer back into the original question.