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I bought my computer in 2016I formatted it; so can I know my original windows product key?
The product specs indicate that your notebook came with FreeDOS, not Windows.
HP Notebook - 15-ba026nt Product Specifications | HP® Customer Support
That means you were responsible for installing Windows, and safeguarding the product key.
Unfortunately, no one will be able to help you, and if you can't find the product key you used to originally install Windows, then you will need to buy a new, genuine Windows product key.
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