```
1+2+3+...+100
=(1+2+3+...+100+1+2+3+...+100)/2
=(1 + 2 + 3+...+100
+100+99+98+...+1)/2
=(101×100)/2
= 5050
```
lightning:cndx@btcdv.com 🐇ᥬ[🐕]᭄🌿
```
1+2+3+...+100
=(1+2+3+...+100+1+2+3+...+100)/2
=(1 + 2 + 3+...+100
+100+99+98+...+1)/2
=(101×100)/2
= 5050
```
lightning:cndx@btcdv.com 🐇ᥬ[🐕]᭄🌿
Wow ⭐⭐⭐