find the sum of first 25 terms of the sequence 12,23,34-.​

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find the sum of first 25 terms of the sequence 12,23,34…..​

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Maria 1 month 2021-08-20T11:54:56+00:00 1 Answer 0 views 0

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    2021-08-20T11:55:57+00:00

    Answer:12+23+34+45+56+67+78+89


    This sum can be found quickly by taking the number n of terms being added (here 8), multiplying by the sum of the first and last number in the progression (here 12 + 89 = 101), and dividing by 2:


    n(a1+an)


    2


    8(12+89)


    2


    The sum of the 8 members of this series is 404

    Step-by-step explanation:

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