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- Jan 26, 2012
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Thank you to grgrsanjay for this idea.
Given the sequence where \(\displaystyle a_1=7\), \(\displaystyle a_2=77\), \(\displaystyle a_3=777\) and so on, derive a formula for summing the first n terms of the sequence.
Bonus: Prove through induction that this formula is valid.
Remember to read the POTW submission guidelines to find out how to submit your answers!
Given the sequence where \(\displaystyle a_1=7\), \(\displaystyle a_2=77\), \(\displaystyle a_3=777\) and so on, derive a formula for summing the first n terms of the sequence.
Bonus: Prove through induction that this formula is valid.
Remember to read the POTW submission guidelines to find out how to submit your answers!
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