• 2021 December(E23) Math Question 26

    Sequences and Patterns

    - Arithmetic Sequences

    Arithmetic sequences
    Choice J

    Given that

    a{10}=30a_\{10\}=30
    x=10x=10
    d=2d=2

    so,

    a{n}=a1+d(x−1)a_\{n\}=a_1+d(x-1)
    30=a1+2(10−1)30=a_1+2(10-1)
    30=a1+1830=a_1+18
    ∴a1=12\therefore a_1=12

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