Multiple choice

The next term of the sequence 1, 9, 28, 65, 126, ...... is

  1. 199

  2. 205

  3. 216

  4. 217
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The pattern is cubes plus 1: 1³+1=2, 2³+1=9, 3³+1=28, 4³+1=65, 5³+1=126, 6³+1=217. Alternatively, the pattern is n³+1 where n starts at 1, or (n+1)³+1 for the next term. The next term is 6³+1 = 217.

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