Final answer:
In the context of partnerships, it is only limited partnerships that can retain validity without being documented in a public instrument due to the nature of liability being limited to the partners' contributions.
Step-by-step explanation:
To determine which contracts of partnership will not affect its validity even if not in a public instrument, we must look at the various forms of partnerships and their requirements. According to the question, options such as limited partnerships, partnerships where immovable property is contributed, and partnerships with capital of P3,000.00 or more are given. Of these, limited partnership agreements can be valid without necessarily being drafted as public instruments. This is because the essence of a limited partnership is that partners limit their liability to their investment in the company, without necessarily affecting the partnership's legality when not registered in a public document. However, for the other types of partnerships mentioned, such as those where immovable property is contributed or where the capital is P3,000.00 or more, being in a public instrument can be essential to ensure enforceability and adherence to specific regulations that govern these transactions.