How many water molecules are released when 4 glucose amylose forms?

The right answer is 3 water molecules.

A condensation reaction is a chemical reaction in which two molecules, or two parts of the same molecule, combine to form a molecule (the condensate) by eliminating a single molecule (the by-product), such as water. (most often), hydrogen sulphide, methanol or acetic acid.

Here are the reactions for this question:

Glucose + Glucose → G-G + by-product (water).

G-G + Glucose → G-G-G + by-product (water).

G-G-G + Glucose → four-glucose-polymer + by-product (water).