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20 November, 21:00

What is the 32nd term of the arithmetic sequence where a1 = - 31 and a9 = - 119?

... ?

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  1. 20 November, 21:10
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    In order to solve for a nth term in an arithmetic sequence, we use the formula written as:

    an = a1 + (n-1) d

    where an is the nth term, a1 is the first value in the sequence, n is the term position and d is the common difference.

    First, we need to calculate for d from the given values above.

    a1 = - 31 and a17 = - 119

    an = a1 + (n-1) d

    -119 = - 31 + (9-1) d

    d = - 11

    The 32nd term is calculated as follows:

    a32 = a1 + (n-1) d

    a32 = - 31 + (32-1) (-11)

    a32 = - 372
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