Question

If the 10th term of an A.P is 21 and the sum of first 10th term is 120 find the nth term


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Answer 1

Answer:

Step-by-step explanation:

given, a10 =52                  

        a + 9d =52 ...........(1)

also,    a17 = 20+a13

       a + 16d =20+a+12d

        16d-12d=20

         4d=20

           d = 5

  putting the value of d in eq. (1), we get,

            a + 9(5) =52

           a +45 = 52

               a = 7

   hence, the required AP is 7,12,17,........

Answer 2

here is the correct answer