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GBN window size=4.

At one transmission we can send 4 frames.

1st transmission:: 1,2,3,4

2nd : ${\color{Red} 5},6,7,8$

3rd:$5,{\color{Red}6},7,8$

4th :$6,7,{\color{Red}8},9$

5th :8,9,10.

Total transmissions(X) =19.

SELECTIVE REPEAT:

1st :1,2,3,4

2nd:${\color{Red} 5},6,7,8$

3rd:$5,{\color{Red} 9},10$

4th :9.

Total transmission(Y)=12

Hence X+Y=19+12=31

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