The average of the middle two fractions, if 4⁄7, 1⁄3, 2⁄3, 5⁄9 are arranged in ascending order is ______.
A 4⁄9
B 71⁄63
C 4⁄18
D 71⁄126
The average of the middle two fractions, if 4⁄7, 1⁄3, 2⁄3, 5⁄9 are arranged in ascending order is ______.
A 4⁄9
B 71⁄63
C 4⁄18
D 71⁄126