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In the highlighted part part is 15,000 given An or Sn?

Navdeep Singh
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    Given that the previous sentence asks for the total production in the first 10 years, surely they are asking when Sn reaches 15000. – Jaap Scherphuis Jan 16 '23 at 10:54

1 Answers1

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They ask for $S_n$.

In situations like this, you can look at previous questions for clarity.

In questions "I" and "II," they ask for the production in the $1^{st}$ year and $12^{th} year$ which clearly mean $A_n$ because they ask specifically for those years.

In the question that you circled, they use the word "total production" meaning all the production combined up to that point. Otherwise, they would have followed the pattern of questions "I" and "II" in which they don't use the word "total".

Chhangsreng P
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