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    Find the number of terms in each of these geometric progressions

    3,6,12,...,768 well i just want to know how to do this then ill know all of em
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    ...................what?
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    My english is rubbish what i wanted to say was i would appreciate some assistance on how to find the number of terms in the sequence. WOOPS WRONG FORUM
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    (Original post by Ganhad)
    Find the number of terms in each of these geometric progressions

    3,6,12,...,768 well i just want to know how to do this then ill know all of em
    u_n = ar^{n-1}

    You've been given u_n and a. You can work out r which leaves you to plug the numbers to find n.
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    I have no idea what you have just said but I'm gonna go with 9?

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