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  1. S

    How do I write the formula for this?

    1, -1, 1, -1, 1,.. find (a_n)
  2. S

    How do I write the formula for this?

    1, -1, 1, -1, 1,.. find (a_n)
  3. S

    How do I write the formula for this?

    I'm sorry for all these questions :\ I don't understand at all! Find a_n. 1, 2, 2²/2, 2³/6, 2^4/24, 2^5/120 So far, i got a_n = 2^(n-1)/???
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