Find the minimum sum-of-products expression
f(a, b, c, d) = (maxterm numbers)(1, 2, 3, 4, 9, 15)
When I made a Karnaugh map for the maxterms, I came up with
(B+C+D')(A+B +C')(A+B'+C+D)(A'+B'+C'+D')
a) I think that's incorrect, perhaps due to my groupings of the 0's.
b) If my answer is in fact correct, I can't figure out how to put it into a product of sums form. I just applied DeMorgan laws on it, but I'm not sure that's correct either. Please help?
This is basically a maxterm expansion from a Karnaugh map (which I may or may not have grouped incorrectly) that I need in SOP

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Also, I think you forgot to include 0 and 14 in your list of minterms...?

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