Multiple choice

What is the 17th term of the sequence 3, 6, 11, 18, 27, ...?

  1. 222

  2. 224

  3. 291

  4. 298
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

nth term = a + (n – 1) d + ${\frac 12}$ (n – 1) (n – 2) c             = 3 + (n – 1) 3 + ${\frac 12}$(n2 – 3n + 2) 2             = 3 + 3n – 3 + n2 – 3n + 2             = n2 + 2 17th term = (17)2 + 2             = 289 + 2 = 291

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