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Mathematics, 09.02.2021 14:00 zel117
The third term in an arithmetic sequence is 9 and the fifth term is 21 . If the first term if a1, which is an equation for the nth term of this sequence?
A:an=6n-9
B:an=14n+6
C:an=6n+14
D:an=9n-6
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The third term in an arithmetic sequence is 9 and the fifth term is 21 . If the first term if a1, wh...
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