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Please help with the below:

Find an expression for the nth term of the given sequence.

a). 3,6, 12,24, ...
b). 151,142,133,124, ...

  • math -

    (a) should be easy -- each term is twice as big
    Tn = 3/2 * 2^n

    (b) each term is 9 less, so
    Tn = 160-9n

  • math -

    Thank you.

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