What is the significance of SEVEN brothers in Luke 20:29?

27 Then some of the Sadducees, who say there is no resurrection, came to question Him. 28“Teacher,” they said, “Moses wrote for us that if a man’s brother dies and leaves a wife but no children, the man is to marry his brother’s widow and raise up offspring for him.d 29 Now there were seven brothers. The first one married a wife, but died childless. 30 Then the second 31 and the third married the widow, and in the same way all seven died, leaving no children. 32 And last of all, the woman died. 33 So then, in the resurrection, whose wife will she be? For all seven were married to her.”

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