Rashi to Miketz (Bereishit 42:13-14) says that the brothers told Yosef that they came to Egypt to look for their missing brother.
However, in Vayigash (Bereishit 44:20) Yehudah tells Yosef that they had told the viceroy that "his [Binyamin's] brother is dead."
How, then, could Rashi say that they had actually told Yosef that their brother was alive?