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5 July, 00:26

Given two terms in artimetic sequence find the common difference, the 52 term, and the explicit formula. A15=139 and A30=259

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  1. 5 July, 00:36
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    139, 149, 159, 169, 179, 189, 199, 209, 219, 229, 239, 249, 259.

    The common difference is 13.

    Let n = 52

    Let d = common difference

    a_52 = 139 + (52 - 1) (13)

    a_52 = 139 + (51) (13)

    a_52 = 139 + 663

    a_52 = 802
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