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Which term of AP 5,9,13,17----------------is81

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Which term of AP 5,9,13,17----------------is81

    • Posted by Sheetal Kumari 6 years, 4 months ago

    CBSE > Class 10 > Mathematics
    • 5 answers

    Ankit ?? Kumar 6 years, 4 months ago

    The 20th term of given ap is 81

    1Thank You

    Sarita Rajput 6 years, 4 months ago

    a=5 :d=9-5=4 :an=81 : n=..? an=a+(n-1)d 81=5+(n-1)4 81-5=(n-1)4 76=(n-1)4 76/4= n-1 19 =n-1 19+1 =n n=20

    2Thank You

    Mayank Sharma 6 years, 4 months ago

    a=5, d=9-5=4. an=81. an=a+(n-1)d. 81=5+(n-1)4. 81-5=(n-1)4. 76÷4=n-1. 19=n-1. 19+1=n. 20=n

    3Thank You

    Aadya Singh 6 years, 4 months ago

    a = 5 , d = 9-5=4 , Tn=81 , n= ? AP of n th term is given by, Tn= a+ (n-1)d . Then, Tn = 5+(n-1)4 81= 5+4n-4 81+1=4n n= 82/4 n= 2.5 th term

    0Thank You

    Bhaskar .T 6 years, 4 months ago

    An=a+(n-1)d 81=5+(n-1)4 81=5+4n-4 81=1+4n 81-1=4n 80=4n 80/4=n N=20

    0Thank You

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