(1) If several accused persons are jointly indicted, and it is proposed to try them together, they or any of them may either join in their challenges, in which case the persons who do so join shall have only as many challenges as a single person would be entitled to, or each may make his or her challenges in the same manner as if he or she were intended to be tried alone.
(2) Where accused persons join in their challenges, not more than 15 jurors shall be peremptorily challenged by the accused persons.
(3) If the accused persons join in their challenges, the prosecutor shall have as many challenges as a single person would be entitled to but if the accused persons do not so join, the prosecutor shall be entitled to make his or her challenges as if each accused was intended to be tried alone and not more than 15 jurors shall be peremptorily challenged in any such trial by the prosecutor.