In the word "pear," there are a total of four letters: P, E, A, and R. Each letter appears once, so there are no pairs of letters. Therefore, the number of pieces of each letter in pairs is zero.
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.
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.
Each player starts with 12 pieces.
Approximately 2.4 billion pairs of shoes are sold in the US each year.
Each human has 23 pairs or 46 chromosomes
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.
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.
64
They have two pairs of wings. So four wings in total. two on each side.