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17 April, 21:06

First 5 terms of a sequence are 7,10,13,16 and 19. Which of the following functions define this sequence for all integers n>1

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Answers (1)
  1. 17 April, 22:58
    0
    This is an arithmetic sequence since there is a common difference between each term. In this case, adding

    3

    to the previous term in the sequence gives the next term. In other words,

    a

    n

    =

    a

    1

    +

    d

    (

    n

    -

    1

    )

    .

    Arithmetic Sequence:

    d

    =

    3

    This is the formula of an arithmetic sequence.

    a

    n

    =

    a

    1

    +

    d

    (

    n

    -

    1

    )

    Substitute in the values of

    a

    1

    =

    7

    and

    d

    =

    3

    .

    a

    n

    =

    7

    +

    (

    3

    )

    (

    n

    -

    1

    )

    Simplify each term.

    Tap for more steps ...

    a

    n

    =

    7

    +

    3

    n

    -

    3

    Subtract

    3

    from

    7

    .

    a

    n

    =

    3

    n

    +

    4
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