Posted by **charles** on Saturday, September 17, 2011 at 7:17am.

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 -
**Reiny**, Saturday, September 17, 2011 at 8:51am
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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