arithmetic

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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 -

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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