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If an = n(n+2), what is a9? 20 99 108 120
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2 votes
If an = n(n+2), what is a9?

20


99


108


120

User Aloisdg
by
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2 Answers

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an = n(n+2)

⇒ a9 = 9(9+2) = 9 × 11 = 99

User AdRock
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4.9k points
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a_(n) = n(n + 2) \\ a_(9) = 9(9 + 2) = 99
User Mamykin Andrey
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