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If the third and the ninth …

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If the third and the ninth term of an AP are 4 and 8 respectively,which term of this AP is 0?

    • Posted by Adiy Vindhani 4 years, 9 months ago

    CBSE > Class 10 > Mathematics
    • 2 answers

    Nayan Mishra 4 years, 9 months ago

    Yogita a great job...

    0Thank You

    Yogita Ingle 4 years, 9 months ago

    an​=a+(n−1)d

    a3​=4=a+2d ....(1)

    a9​=−8=a+8d ....(2)

    ∴4−2d=−8d−8

    −2d+8d=−8−4

    6d=−12

    d=−2​

    a=4−2d

    =4+4=8

    an​=0,a=8,d=−2

    0=8+(n−1)×(−2)

    0=8−2n+2

    2n=10

    n=5

    1Thank You

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