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22 January, 23:27

B = {5,7,9,11,14} what is n (B).

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  1. 23 January, 01:30
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    This is an arithmetic progression with d=2 as common difference:

    (7-5 = 2; 9-7 = 2; 11-9 = 2, etc.) and with 1st term a₁ = 5

    a₈ = a₁ + (n-1) d (where n is the number/rank of terms

    a₈ = 5 + 7x2

    a₈ = 19
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