Would like to Know- suppose we've sandbox from which we deploy to production. There is already set (A) of classes, some of whose test classes are failing Now we want to deploy Different set(B) of classes to production from this Sandbox. All test classes related to set(B) are working properly with test coverage > 75
Would I able to deploy set B through change set or any other means?.(Same sandbox has Set A also) Is it necessary to do 'Run all Tests' before deploying into production ?