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\[10 \times (\frac{ 2 }{ 3 })^{k-1}\]
Thats what I got

The answer is \[10 \times (\frac{ 2 }{ 3 })^{n}\]

Could somebody please explain how they got that?

Why n-1?

@Zas does this help?

I think so, thank you!

You're welcome. :]