Quick AP term

Problem Statement

Find $a_{18}$ for the arithmetic sequence $2,7,12,\ldots$.

Hints

Use $a_n=a+(n-1)d$ with $a=2$ and $d=5$.

Solutions

Further Readings

• HSC Combinatorics: https://vumaths.com/booklets/hsc-combinatorics/
• HSC Mechanics: https://vumaths.com/booklets/hsc-mechanics/
• HSC Vectors: https://vumaths.com/booklets/hsc-vectors/
• HSC Last Resorts: https://vumaths.com/booklets/hsc-last-resorts/

Connect with me

• LinkedIn: https://www.linkedin.com/in/nguyenvuhung/
• YouTube - HSC Maths Extension 1+2: https://www.youtube.com/playlist?list=PLHSE0sAlTr2w
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