Multiple choice general knowledge math & puzzles Find the next number in the series -14 , -11 , -6 , 1 , 10 16 21 24 18 Reveal answer Fill a bubble to check yourself B Correct answer Explanation The differences between consecutive terms are increasing odd numbers: -14+3=-11, -11+5=-6, -6+7=1, 1+9=10. The next difference is 11, so 10+11=21.