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Sequences and series problem

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    1. An ancient druid tribe built 100 seats in a circle round their new altarfor their first May Day celebrations. For the following May Day, theybuilt another ring of 110 seats round the first ring. They built a furtherring of 120 seats round that for the following year, and so on.
      1. (a) Find the total number of seats round the altar for the nth May Day
        at the new altar.

    I think I'm simply missing a simple detail here thanks or any help in advance.

    (Original post by jonathan14)
    I think I'm simply missing a simple detail here thanks or any help in advance.
    1st May Day: 100

    2nd May Day: 110

    3rd May day: 120

    4th May day: 130

    heard of an arithmetic sequence? u_n = a + (n-1)d where n is the nth term, a is the first term, and d is the common difference.
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