1. Where there is a concurrence of several creditors, or of several debtors, or of several creditors and debtors in one and the same obligation - what is the nature of the obligation - is it joint or solitary?

2. Pedro sold a piece of land to this nephew Quintin, a minor. One month later, Pedro died. Pedro's heirs then brought an action to annul the sale on the ground that Quintin was a minor and therefore without legal capacity to contract. Is the sale valid?

3. What is meant by a stipulation pour autrui? What requisites must concur in order that such stipulation may be enforced?

4. In no. 3, what is the form of the acceptance by the third person or beneficiary?

5. How may a voidable contract be convalidated?