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first term and larst term of a geometric progression is 42.if the forth term is greater than the second term by 168, find the first term.the forth term.

  • arithmetic -

    check your typing.

    If the first and last term of a GS are the same, then r = 1, that is, the terms do not change.
    But then how can there be a difference between the fourth and second term?

    Did you mean..
    "The sum of the 1st and last terms is 42" ?

    Either way, you would have a major problem:
    you have 3 unknowns, a, r, and n
    but only two sets of information.

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