We're told that
where the last fact is due to the law of total probability:
so that and are complementary.
By definition of conditional probability, we have
We make use of the addition rule and complementary probabilities to rewrite this as
By the law of total probability,
and substituting this into gives
Think about it this way:
26 * 19 = ?
(26 + 10) x (26 + 9)
Hope this helps
Answer:
x = −5.5 i think
Step-by-step explanation:
Good Luck!