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22-12-2020
Mathematics

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Given the Arithmetic Sequence 9,12,15,18,21,...find the formula
1. A(n)=3+(n-1)9
2. A(n)=9+(n-1)3
3. A(n)=21+(n-1)9
4. A(n)=9+(n-1)21

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22-12-2020

Answer:

#1

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