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The 3rd and 12th terms of an arithmetic progression are 12 and -24 respectively. What is the 50th term?

  • Math -

    a+2d=12
    a+11d=-24
    subtract them
    9d = -36
    d = -4
    then a-8=12
    a=20

    term(50) = a+49d
    = ...

  • Math -

    what is the product of 23 and 45.

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