ACT 2017 April(74F) Math Question 53 Explanation - ACT Helper

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2017 April(74F) Math Question 53
Sequences and Patterns
- Arithmetic Sequences
Choice A
$a_{3} = 13 a_{4} = 18$ $\Rightarrow d = a_{4} - a_{3} = 5$ $\Rightarrow a_{50} = a_{4} + (50 - 4) \times d = 248$
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