Made improvements to combinations.py (#3681)

* Made improvements to combinations.py

* Update maths/combinations.py

Co-authored-by: Du Yuanchao <shellhub.me@gmail.com>

* Function now raises an error when given invalid input

* Update maths/combinations.py

Co-authored-by: Du Yuanchao <shellhub.me@gmail.com>

Rolv Apneseth committed 5y ago

8f81c460fef5294026015d2e39ef0e35f2e99e27

Parent: 47199c1

Committed by GitHub <noreply@github.com> on 10/26/2020, 6:48:06 AM