Question

Can I have help finding the formula in terms of n for using the image?

Answer 1

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STEP-BY-STEP EXPLANATION:

We can see that the first 3 steps:

`\begin{gathered} s_1=1\cdot(1)=1 \\ s_2=2\cdot(1+2)=6 \\ s_1=3\cdot(1+2+3)=18 \end{gathered}`

Therefore, the formula could be the following