Multiple choice general knowledge math & puzzles Find out the wrong number in the series. 15, 16, 34, 105, 424, 2124, 12576 16 34 105 424 2124 Reveal answer Fill a bubble to check yourself E Correct answer Explanation The pattern is: (15*1)+1=16, (16*2)+2=34, (34*3)+3=105, (105*4)+4=424, (424*5)+5=2125. The sequence lists 2124 instead of 2125, making 2124 the wrong number.