As Laura's mother rushed off to work, she quickly gave Laura some instruct
me, try my cell ... if I don't answer it means I'm in a meeting, but don
neaps I'm in a meeting, but don't worry, the meeting
won't last more than 30 minutes and I'll call you back when it's over." Later than
needed her mother, but her mother was stuck in a meeting and couldn't answer ih
Laura concludes that she will have to wait no more than 30 minutes before she gete
from her mother. What law of logic did Laura use to draw this conclusion?