Compatable ink videotape?

I own a Lexmark 3100 Series printer. I bought a combo pack (2 cartridges) of black and colored ink. I know that one of them, the color tape: 20, works with my printer. But I'm not sure if the other one, which is a 70, is compatible. I no longer enjoy the box it came near so i can't check it, and I don't want to open it single to realize it isn't compatible with my computer. Can I use the number 70 Black ink videotape for my 3100 printer?

Answer:
Yes, the purpose of Lexmark combo packs is for you to enjoy both cartridges for your printer in one box at a price slightly smaller number than if you bought the cartridges individually.

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