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