“Yeah, no problem.”
You're sitting in a coffee shop. Someone who you don't know asks if you will watch over her stuff for her. You say this because you don't mind.
Yeah, no problem.
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"No problem" means "yes" or "sure". It is a response that you say to someone who asks you to do something:
A: Could you hold that for me?
B: Sure, no problem.
You can also say "No problem" when someone thanks you for doing something:
B: No problem.
"Yeah" is a more casual way of saying "yes".
Say this to agree with something that a person said:
You can also say "yeah" when you're going to disagree but you want to make your disagreement sound a little softer.
"Yeah" sounds less formal than "yes."