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The sum of given A.P.1, 4 …

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The sum of given A.P.1, 4 , 7 , 10 , . . . upto 20 terms is____________ .

    • Posted by Pranjal Jangid 5 years, 1 month ago

    CBSE > Class 10 > Mathematics
    • 1 answers

    Yogita Ingle 5 years, 1 month ago

    a = 1 d = 4-1 = 3

    an = a + (n-1)d

    a20 = 1 + (20-1)3

    a20 = 1 + (19)3

    a20= 1 + 57

    a20= 58

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