Multiple choice The missing number in the sequence (5, 6, 15, ?, 89, 170, 291) is 50 40 42 32 Reveal answer Fill a bubble to check yourself B Correct answer Explanation The pattern involves differences: 6-5=1, 15-6=9, ?-15=25, 89-?=49, 170-89=81, 291-170=121. The differences are 1, 9, 25, 49, 81, 121 (squares of odd numbers). So 49+40=89.