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13 January, 15:10

Given the Arithmetic sequence A1, A2, A3, A4 61, 74, 87, 100 What is the value of A15?

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  1. 13 January, 15:24
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    A15=243

    74-61=13

    87-61=13

    So they're adding 13 every time.

    A15 is 11 terms from A4 which is the last one you are given so 11*13=143

    143+100=243
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