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27 June, 00:50

L=a + (n-1) d

solve for n

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Answers (1)
  1. 27 June, 02:23
    0
    (L-a) / d + 1 = n

    Step-by-step explanation:

    Let's isolate (n-1), and after that isolate n:

    1) subtract a from both sides: L - a = (n-1) d

    2) Divide both sides by d: (L-a) / d = n-1

    3) Add 1 to both sides, to isolate n: (L-a) / d + 1 = n
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