Here's why:
* Schwa sound: The schwa is a vowel sound represented by the upside-down "e" symbol (ə). It's a very short, unstressed vowel sound.
* "Memory" pronunciation: In the word "memory", the emphasis is on the second syllable, "mo". This means the first syllable, "mem", is unstressed.
* Unstressed vowel sound: Unstressed vowels in English often reduce to the schwa sound.
Therefore, the schwa sound in "memory" is in the "mem" syllable.