If matrix M has element 
, what is 
? 
Definitions:
Life Expectancy
The typical duration a person is anticipated to live.
Autoimmune Theory
A theory suggesting that certain diseases or conditions are caused by the immune system mistakenly attacking the body's own healthy cells and tissues.
Alzheimer Disease
A progressive neurological disorder that causes brain cells to waste away and die, leading to a continuous decline in thinking, behavioral, and social skills.
Life Expectancy
The average period that a person may expect to live, often influenced by factors like genetics, lifestyle, and environment.
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