Is it permissible to fast one day from the six white days (Shawwal) along with one day from the three white days (Ayyam al-Beed)?

If a Muslim intends to fast the White Days and six days of Shawwal, he will receive the reward for both, because the fasting of the mentioned days is directed by their intention, and even if he intends to fast other than them during these days, he will still receive their reward.