Multiple choice

What is the 12th term of the sequence 2, 5, 10, 17,...?

  1. 145

  2. 144

  3. 143

  4. 142
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A Correct answer
Explanation

The sequence is 2, 5, 10, 17... which is n^2 + 1 for n=1, 2, 3, 4. The 12th term is 12^2 + 1 = 144 + 1 = 145.

AI explanation

The terms follow the formula n^2 + 1. Applying this formula for the 12th term, we square 12 and add 1. This yields 144 + 1, which equals 145.

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