Final answer:
A newborn with three copies of the X chromosome (XXX), also known as triple X syndrome, is most likely to survive.
Step-by-step explanation:
A newborn with three copies of the X chromosome (XXX) is most likely to survive. This condition is known as triple X syndrome or trisomy X. In individuals with triple X syndrome, the presence of an additional X chromosome does not typically cause severe physical or developmental abnormalities.
Learn more about Triple X syndrome