Medium
In the number series, one term is missing. Find the missing term: 3, 15, 35, 63, 99, (?)
Explanation
Explanation
The differences are 12, 20, 28, 36; they increase by 8. The next difference is 44, so 99 + 44 = 143.
PRO TIP
Re-check your working by substituting the answer back into the original question.