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17 July, 03:21

Find the 98th term for the arithmetic sequence 3,4.2,5.4,6.6,7.8, ...

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  1. 17 July, 03:29
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    A₁ = 3

    a₂ = 4.2

    d = a₂ - a₁

    = 4.2 - 3

    = 1.2

    a₉₈ = a₁ + d (n-1)

    = 3 + 1.2 (98-1)

    = 3 + 1.2*97

    = 3 + 116.4

    = 119.4
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