23 pairs in each cell
2 pairs, the sides opposite each other are congruent to each other
A parallelogram has two pairs of congruent sides.
Each player starts with 12 pieces.
I don't completely understand what you mean by "pieces". Humans have 23 pairs of chromosomes. That means they have 46 "pieces". 23 come from each parent. DNA is concentrated into little rods called chromosomes. There are two "pieces" on each chromosome.
Approximately 2.4 billion pairs of shoes are sold in the US each year.
Each human has 23 pairs or 46 chromosomes
24 pieces (12 of each color, 3 rows of 4 on each side of the board)
166,875,000,000 pieces of mail are delivered each year in the U.S.
H2SO4 does not have any lone pairs. It has 2 bonding pairs shared between sulfur and oxygen in each of the O=S=O bonds. Each oxygen also has 2 unshared pairs of electrons.
64
24 each