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  1. If a2 + a + 1 = 0, then the value of a9 is
    1. 2
    2. 3
    3. 1
    4. 0
Correct Option: C

Using Rule 9,
a2 + a + 1 = 0
⇒ (a – 1) (a2 + a + 1) = 0
⇒ a3 – 1 = 0
⇒ a3 = 1 ⇒ a = 1
∴ a9 = 1


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