in a geometric progression a4 * a5=1/64
a1*a2*a3*a4....*a13=?
Hello, parmis!
There are at least 4 possible solutions . . .
We are given: .
I found four cases: .
Take the first case: .
We find that: .
Then: .
. . . . . . . .
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. . . . . . .
You can work out the other three solutions.