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Math Help - nth term

  1. #1
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    nth term

    any to help me with this problem!!!

    find the nth term of the series
    1,2,4,7,11

    thanks for your answers in advance
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  2. #2
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    The difference in each consecutive term is increasing by 1.

    1,2,4,7,11,\dots

    1(+1)=2

    2(+2)=4

    2(+3)=7

    and so on
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  3. #3
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    Quote Originally Posted by khotso View Post
    any to help me with this problem!!!

    find the nth term of the series
    1,2,4,7,11

    thanks for your answers in advance
    00+01 = 01 = a(00)
    01+01 = 02 = a(01)
    02+02 = 04 = a(02)
    03+04 = 07 = a(03)
    04+07 = 11 = a(04)
    05+11 = 16 = a(05)
    06+16 = 22 = a(06)
    07+22 = 29 = a(07)
    08+29 = 37 = a(08)
    09+37 = 46 = a(09)
    10+46 = 56 = a(10)

    a(n) = a(n-1) + n

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  4. #4
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  5. #5
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    yes that is the answer
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