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Math Help - Sequences and Summations (1)

  1. #1
    Junior Member
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    Sequences and Summations (1)

    Just want to verify my answers, if there are wrong answers then plz help me.


    1) Give the first 4 terms of the following sequences
    (indices begin at 0; you need not multiply everything out):

    a) {An} = (-2)^n

    b) {An} = 3

    c) {An} = 7 + 4^n

    d) {An} = 2^n + (-2)^n

    My answers:

    a) 1,-2,4,-8
    b) 3
    c) 1,11,23,71
    d) 2,0,8,0
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  2. #2
    Super Member
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    Israel
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    Quote Originally Posted by kashifzaidi View Post
    Just want to verify my answers, if there are wrong answers then plz help me.


    1) Give the first 4 terms of the following sequences
    (indices begin at 0; you need not multiply everything out):

    a) {An} = (-2)^n

    b) {An} = 3

    c) {An} = 7 + 4^n

    d) {An} = 2^n + (-2)^n

    My answers:

    a) 1,-2,4,-8
    b) 3
    c) 1,11,23,71
    d) 2,0,8,0
    b) should be 3,3,3,3

    for c), how much is 7+4^0? Definitely not 1! The other terms are correct though, and so are a) and d).
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