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Let X be the set consisting of the first 2018 terms of the arithmetic progression 1,6,11, ... , and Y be the set consisting of the first 2018 terms of the arithmetic progression 9,16,23, ... . Then `n(X uu Y) = ______`

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Let X be the set consisting of the first 2018 terms of the arithmetic progression 1,6, 11,.... and Y be the set consisting of the first 2018 terms of the arithmetic progression 9,16,23,... Then, the number of elements in the set X uu U is ____

Let X be the set consisting of the first 2018 terms of the arithmetic progression 1, 6, 11 , ddot, and Y be the set consisting of the first 2018 terms of the arithmetic progression 9, 16 , 23 , ddot . Then, the number of elements in the set XuuY is _____.

Knowledge Check

  • In an artimetic progression, the 24th term is 100. Then, the sum of the first 47 terms of the arithmetic progression is

    A
    2300
    B
    2350
    C
    2400
    D
    4700

  • If the sum of the first 100 terms of an arithmetic progression is -1 and the sum of the even terms is 1, then the 100^("th") term of the arithmetic progression is

    A
    `(47)/(25)`
    B
    `(149)/(50)`
    C
    `(74)/(25)`
    D
    `-(149)/(50)`

  • Suppose the sum of the first m teams of a arithmetic progression is n and the sum of its first n terms is m, where mnen. Then the dum of the first (m + n) terms of the arithmetic progression is

    A
    1- mn
    B
    mn- 5
    C
    `-(m = n)`
    D
    m + n

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    The sum of the first three terms of an arithmetic progression is 9 and the sum of their squares is 35. The sum of the first n terms of the series can be

    (1) .Let S_n denote the sum of the first 'n' terms and S_(2n)= 3S_n. Then, the ratio S_(3n):S_n is: (2) let S_1(n) be the sum of the first n terms arithmetic progression 8, 12, 16,..... and S_2(n) be the sum of the first n terms of arithmatic progression 17, 19, 21,....... if S_1(n)=S_2(n) then this common sum is

    If the sum of the first 23 terms of an arithmetic progression equals that of the first 37 terms , then the sum of the first 60 terms equals .

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