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I'm trying to solve this but I'm confused with different answers. I'm getting 4 but the answer written is 7. Please guide me.

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    $\begingroup$ Don't use images as main content of your post. This makes your question impossible to search and inaccessible to the visually impaired; we don't like that. Please transcribe text and mathematics. You can use LaTeX. Don't forget to give proper attribution to your sources! $\endgroup$
    – Nathaniel
    Jan 6, 2022 at 16:40
  • $\begingroup$ (What is the exact definition of (number of) prime implicants you are required to use? Look at the complemented map/"the 0s".) $\endgroup$
    – greybeard
    Jan 7, 2022 at 7:11

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It's 4 because you're allowed to "wrap around" from the top edge to the bottom edge or from the right edge to the left edge (those moves still represent 1-bit changes because the Gray code is cyclic).

So there is one PI of 3 minterms in the first column, one in the fourth column, one in the third row, and one of 2 minterms in the second row.

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