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Answer:

If a boy is facing the east direction and turns 13/4 of a revolution in the clockwise direction, it means he has completed (13/4) * 360 = 1170 degrees rotation.

Since one complete rotation is equal to 360 degrees, we can subtract 3 complete rotations (3 * 360 = 1080) from 1170 to find the net rotation:

1170 - 1080 = 90 degrees

Therefore, the boy will be facing the south direction after rotating 13/4 of a revolution in the clockwise direction.