![In a geometric series, the first term = a , common ratio = r . If Sn denotes the sum of the n terms and Un = ∑n = 1^nSn , then rSn + (1 - r)Un equals to In a geometric series, the first term = a , common ratio = r . If Sn denotes the sum of the n terms and Un = ∑n = 1^nSn , then rSn + (1 - r)Un equals to](https://i.ytimg.com/vi/Sb21_v50AN4/maxresdefault.jpg)
In a geometric series, the first term = a , common ratio = r . If Sn denotes the sum of the n terms and Un = ∑n = 1^nSn , then rSn + (1 - r)Un equals to
![Coatings | Free Full-Text | Electrodeposition of Sn and Sn Composites with Carbon Materials Using Choline Chloride-Based Ionic Liquids Coatings | Free Full-Text | Electrodeposition of Sn and Sn Composites with Carbon Materials Using Choline Chloride-Based Ionic Liquids](https://www.mdpi.com/coatings/coatings-09-00798/article_deploy/html/images/coatings-09-00798-g005.png)
Coatings | Free Full-Text | Electrodeposition of Sn and Sn Composites with Carbon Materials Using Choline Chloride-Based Ionic Liquids
![Coatings | Free Full-Text | Electrodeposition of Sn and Sn Composites with Carbon Materials Using Choline Chloride-Based Ionic Liquids Coatings | Free Full-Text | Electrodeposition of Sn and Sn Composites with Carbon Materials Using Choline Chloride-Based Ionic Liquids](https://www.mdpi.com/coatings/coatings-09-00798/article_deploy/html/images/coatings-09-00798-g004b.png)
Coatings | Free Full-Text | Electrodeposition of Sn and Sn Composites with Carbon Materials Using Choline Chloride-Based Ionic Liquids
![One-Step Synthesis of Na–Sn Alloy with Internal 3D Na15Sn4 Support for Fast and Stable Na Metal Batteries | ACS Applied Energy Materials One-Step Synthesis of Na–Sn Alloy with Internal 3D Na15Sn4 Support for Fast and Stable Na Metal Batteries | ACS Applied Energy Materials](https://pubs.acs.org/cms/10.1021/acsaem.1c03208/asset/images/medium/ae1c03208_0001.gif)
One-Step Synthesis of Na–Sn Alloy with Internal 3D Na15Sn4 Support for Fast and Stable Na Metal Batteries | ACS Applied Energy Materials
![The structures of α-and β-Sn. The tetragonal unit cell of β-Sn is drawn... | Download Scientific Diagram The structures of α-and β-Sn. The tetragonal unit cell of β-Sn is drawn... | Download Scientific Diagram](https://www.researchgate.net/publication/250467447/figure/fig1/AS:670699127599105@1536918541152/The-structures-of-a-and-b-Sn-The-tetragonal-unit-cell-of-b-Sn-is-drawn-with-a-solid_Q320.jpg)