Hard
Find the wrong term in the number series: 10, 15, 26, 35, 48, 63, 82
Explanation
Explanation
The terms follow the pattern (n squared +/-1) for n=3 to 9, alternating +1 and -1: 3sq+1=10, 4sq-1=15, 5sq+1=26, 6sq-1=35, 7sq+1=50, 8sq-1=63, 9sq+1=82. The 5th term should be 50, but 48 is given, so 48 is the wrong term.
PRO TIP
Re-check your working by substituting the answer back into the original question.