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in an ap the 10thterm is 68 while it 4th term is 26 find the common different and the ist term

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2 answers

  1. How about just using our definitons
    "the 10thterm is 68" ----> a + 9d = 68
    "the 4th term is 26 " ----> a + 3d = 26
    subtract them:
    6d = 42
    d = 7
    back in a + 3d = 26
    a + 21 = 26
    a = 5

    btw, Its called common difference, not different.

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  2. six differences between 4th and 10th ... d = (68 - 26) / (10 - 4)

    1st = 4th - 3 d

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