In an A.P. if a=21, d=-3, and aₙ= 0, then the value of n is

Question

In an A.P. if a=21, d=-3, and aₙ= 0, then the value of n is

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Hadley 5 days 2021-09-14T05:39:27+00:00 2 Answers 0 views 0

Answers ( )

    0
    2021-09-14T05:40:37+00:00

    Answer:

    a=21

    d= -3

    an=0

    a+(n-1)d=0

    21+(n-1)(-3)=0

    21-3n+3=0

    -3n+24=0

    -3n= -24

    n= -24/-3

    n=8

    8th term if AP is 0

    0
    2021-09-14T05:41:07+00:00

    Answer:

    8

    Step-by-step explanation:

    :

    d=−2

    n=5

    a

    n

    =0

    We know:

    a

    n

    =a+(n−1)d

    ∴0=a+(5−1)(−2)

    ∴a=8

    Hence, the value of a is 8.

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