which term of an A.P 21,18,15-. is zero?​

Question

which term of an A.P 21,18,15….. is zero?​

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Amaya 1 month 2021-08-15T09:11:35+00:00 2 Answers 0 views 0

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    0
    2021-08-15T09:12:42+00:00

    Answer:

    8th term

    Step-by-step explanation:

    The AP: 21, 18, 15……

    The first term of the AP, a = 21

    The common difference, d = 18–21 = -3

    nth term of the AP= a+(n-1)*d

    Let the xth term of the AP to be zero.

    So, a+(x-1)d = 0

    or, 21 + (x-1)*(-3)=0

    or, 21 – 3x +3 =0

    or, 3x =24

    Or, x=8.

    Ans. The 8th term of the AP is 0.

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    0
    2021-08-15T09:12:48+00:00

    Answer:

    8th

    Step-by-step explanation:

    Let the nth term be 0

    a = 21

    d = – 3

    Tn = a + ( n – 1)d

    > 0 = 21 + ( n – 1) ( – 3)

    > – 21 = ( n – 1) ( – 3)

    > n – 1 = – 21/-3

    > n – 1 = 7

    > n = 7 + 1

    > n = 8

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