Math

The sum of 11terms of an Ap is 891 find the 28th and 45th terms if the common difference is 15

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asked by Anna
  1. assuming you mean the sum of the first 11 terms is 891, you have
    11/2 (2a + 10*15) = 891
    Having a, you want
    a+27d
    a+44d

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