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Math Help - Sequence help!

  1. #1
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    Sequence help!

    Im really confused on this question:



    I know how to do all the geometric and arethmatic formulae, but i just can't work out the first 4 terms from that formula given. Any suggestions?
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  2. #2
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    Quote Originally Posted by nugiboy View Post
    Im really confused on this question:



    I know how to do all the geometric and arethmatic formulae, but i just can't work out the first 4 terms from that formula given. Any suggestions?
    Hmmm, lessee now ..... If we let r = 1, the rule tells us that a_{2} = a_1 + 3. But holy cow ...... a_1 = 4. So a_2 = 7. Hmmmmm ..... can you play this game when r = 2? r = 3?
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    Quote Originally Posted by mr fantastic View Post
    Hmmm, lessee now ..... If we let r = 1, the rule tells us that a_{2} = a_1 + 3. But holy cow ...... a_1 = 4. So a_2 = 7. Hmmmmm ..... can you play this game when r = 2? r = 3?
    The answer book says its 4 , 7 , 10 , 13
    Which is obviously + 3, but i dont understand how the formula shows that exactly.

    I can see how the first one is 4, as it says a_1 = 4, but i cant see how it shows + 3.
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  4. #4
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    Quote Originally Posted by nugiboy View Post
    The answer book says its 4 , 7 , 10 , 13
    Which is obviously + 3, but i dont understand how the formula shows that exactly.

    I can see how the first one is 4, as it says a_1 = 4, but i cant see how it shows + 3.
    a_{r+1} = a_r + 3. Translation: The next term is 3 more than the previous term. That's what the + 3 in the given rule means!!! What do you think the + 3 means?
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