Answer and Explanation:
Odds ratio is the odds that an outcome would happen given a level of exposure in comparison to the occurrence of that outcome without exposure. Odds ratio is calculated by dividing odds of event occurring with exposure(the first group) by odds of event(usually disease) occurring without exposure. Odds is different from probability(denoted p/1-p). While probability is the number of favorable events divided by total number of events, odds is number of favorable events/number of unfavorable events.
Relative risk, also measuring relationship between exposure and outcome, is the ratio of the probability that an outcome would occur without exposure and probability that an outcome would occur with exposure.
Answer: 3
Step-by-step explanation: got it right on edge
Express the matrix 
like 
, where 
if 
and 
if 
. (
is known as kronecker's delta)
In the same form we express the matrix 
.
The firs index indicate the row and the second the column.
By the multiplication of matrices we have 
, where
because only 
is non-zero in the last sum.
therfore we have 
.
In the same manner we have
, where
And so, 
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Step-by-step explauuuuuuuuuuu
