How many atoms of $H$ and $O$ are lost when a disaccharide is formed from monosaccharides?

Which monosaccharide does not have the ratio of $H$ and $O$ atoms as $2:1$?

All monosaccharides are:

Glycogen is stored in . . . . . . .

Glycogen is:

Identify the disaccharides formed by the combination of the following monosaccharides:
Glucose + Glucose $\rightarrow P$
Glucose + Galactose $\rightarrow Q$
Glucose + Fructose $\rightarrow R$