Sigma notation: changing the index

<ol class="abc-list"><li><div class="list-item-paragraph">Expand \( \sum_{r=4}^7{2^r}\) as the sum of four terms.</div></li><li><ol class="i-list"><li><div class="list-item-paragraph">Find the value of \( \sum_{r=4}^{30} {2^r} \).</div></li><li><div class="list-item-paragraph">Explain why \( \sum_{r=4}^{\infty} {2^r} \) cannot be evaluated.</div></li></ol></li></ol>

Expand \( \sum_{r=4}^7{2^r}\) as the sum of four terms.

Geometric Progression

Sequence and Series

International Baccalaureate Mathematics: Applications and Interpretation Standard Level

Sequence and Series - Geometric Progression

Sequence and Series - Geometric Progression