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The 14th term of an Ap is double the 4th term.find the 10th term if the 2nd term is 8

  • Maths - ,

    2nd term = 8 ----> a+d = 8 , #1

    14th term is double the 4th term

    a+13d = 2(a+3d)
    a+13d = 2a + 6d
    a - 7d = 0 , #2

    #1 - #2:
    8d = 8
    d = 1
    then a=7

    term 10 = a+9d = 7 + 9 = 16

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