Find the 20th term of the sequence: 7, 3, -1=.

Question

Find the 20th term of the sequence: 7, 3, -1………….

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1 month 2021-08-19T07:07:34+00:00 2 Answers 0 views 0

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    0
    2021-08-19T07:09:00+00:00

    a20 = a + 19d

    a = 7

    d = 3-7

    d = -4

    a20 = 7 + 19(-4)

    a20 = 7 -76

    a20 = -69

    0
    2021-08-19T07:09:14+00:00

    We can see that the common difference is -4,
    Now, these are in AP,
    => nth term = a + (n-1)d, where a is first term and d is common difference
    So, 20th term = 7 + ( 20-1)(-4) = 7 – 76 = -69

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