beevus6258
beevus6258
03-10-2018
Mathematics
contestada
If an = n(n+2), what is a9?
20
99
108
120
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Kamikazeminem
Kamikazeminem
03-10-2018
[tex]a_{n} = n(n + 2) \\ a_{9} = 9(9 + 2) = 99[/tex]
Answer Link
Tucon
Tucon
03-10-2018
an = n(n+2)
⇒ a9 = 9(9+2) = 9 × 11 = 99
Answer Link
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