SOLUTION: a1=5, r=3, a12=?

Question 1087532: a1=5, r=3, a12=?
Found 3 solutions by ikleyn, MathLover1, Fombitz:
Answer by ikleyn(52788)   (Show Source): You can put this solution on YOUR website!
.
Impossible to solve and/or answer without knowing which progression/sequence is it.

Answer by MathLover1(20850)   (Show Source): You can put this solution on YOUR website!
it should be geometric sequence if given
In general we write a geometric sequence like this:
{ , , , , ..., }
where:
is the term, and
is the factor between the terms (called the "")
We can also calculate any term using the rule:

if given:
, , to find , where , use the rule above and given data

Answer by Fombitz(32388)   (Show Source): You can put this solution on YOUR website!

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