ACT 2021 June(D06) Math Question 7 Explanation - ACT Helper

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2021 June(D06) Math Question 7
Sequences and Patterns
- Arithmetic Sequences
Choice C
$a_{1} = 6$ $d = 3$ $a_{n} = a_{1} + (n - 1) d$ $=> a_{21} = a_{1} + (21 - 1) \times 3 = 66$
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