1 If the black lines aren't visible on the external screen, the laptop screen may need to be replaced. 2  If the black lines are also visible on the external screen, the video card or motherboard may need to be replaced. 3  In some cases, a loose video card can cause problems with the monitor video.
1. segmentation - (embryology) the repeated division of a fertilised ovum. cleavage. embryology-the branch of biology that studies the formation and early development of living organisms. cell division, cellular division-the process in reproduction and growth by which a cell divides to form daughter cells.
Definition of Permutation. Permutation is an ordered arrangement of a group of objects. More About Permutation. The permutation of n objects taken r at a time is represented as nPr. The permutation or arrangement of 9 different balls in 3 different rows can be done in 9P3 = 504 ways. The permutation of n objects taken all at a time is represented as nPn = n!.