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Find the middle term of the …

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Find the middle term of the AP 6,13,20,...,216.

    • Posted by Vaibhav Singh 5 years, 8 months ago

    CBSE > Class 10 > Mathematics
    • 1 answers

    Yogita Ingle 5 years, 8 months ago

    A=6
    d=7
    Tn= a+ (n-1)d
    216=6+(n-1)*7
    n=31
    total no. of terms=31
    middle term=(31+1)/2
                      =16th 
    T16= a+(16-1)d
          = 6+(15*7)
          =111
    therefore the middle term of the AP is 111

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