Multiple choice

Find the 9th term of the sequence $1, -1, 1, -1...$

  1. $1$
  2. $-1$
  3. $2$
  4. $-2$
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A Correct answer
Explanation

The sequence is 1, -1, 1, -1... The odd terms are 1 and the even terms are -1. The 9th term is odd, so it is 1.

AI explanation

This sequence follows an alternating pattern where odd-positioned terms are 1 and even-positioned terms are -1. Since 9 is an odd number, the 9th term corresponds to the value of the odd positions. Therefore, the 9th term is 1.

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