Multiple choice

Find the missing number in the given series. 109, 110, 102, 129, 65, ?

  1. 160

  2. 179

  3. 180

  4. 190

  5. 195
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The pattern is alternating addition and subtraction of cubed numbers: 109 + 1³ = 110, 110 - 2³ = 102, 102 + 3³ = 129, 129 - 4³ = 65, 65 + 5³ = 190. The series alternates between adding and subtracting consecutive cubes (1, 8, 27, 64, 125). After subtracting 64 from 129 to get 65, we add 125 to get 190. This makes option D correct.

Keep practicing — related questions