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Math

Question

the sum of the first 13 terms of an ap is 416.find its 7th term​

1 Answer

  • Answer:

    [tex]a_{7}[/tex] = 32

    Step-by-step explanation:

    The nth term of an A.P

    [tex]a_{n}[/tex] = a+(n-1)d

    Given;

    We need to find the 7th term;

    [tex]n_{7}[/tex] = a + (7-1)d

    [tex]n_{7}[/tex] = a + 6d

    Sum of n terms [tex]S_{n}[/tex] = n/2 * [2a + (n-1)d]

    Given; Sum [tex]S_{n}[/tex] = 416

    => 416 = 13/2 * [2a + (13-1)d]

    => 416 = 13/2 * [2a + 12d]

    => 416 = 13/2 * 2 * [a + 6d]

    => 416 = 13/2 * 2 * [tex]a_{7}[/tex]

    => [tex]a_{7}[/tex] = (416 * 2)/26

                      = 32

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