Easy
In an AP, the first term is 7 and the common difference is 1. Which term of the AP is 12?
Explanation
Explanation
Using aₙ = a + (n-1)d, set a + (n-1)d = 12: 7 + (n-1)(1) = 12. Solving, (n-1) = (12 - 7)/1 = 5, so n = 6. Thus 12 is the 6th term.
PRO TIP
Re-check your working by substituting the answer back into the original question.