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  • 2021 June(D06) Math Question 7

    Sequences and Patterns

    - Arithmetic Sequences

    Choice C
    $$a_1=6 \\$$ $$d=3 \\$$ $$a_n=a_1+(n-1)d \\$$ $$=> a_{21}=a_1+(21-1)\times3=66$$

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