The determinant of a $4 \times 4$ matrix $A$ is 3 . The value of the determinant of $2 A$ is

$\_\_\_\_$ . (answer in integer)

Expedite, Hasten, Hurry, $\_\_\_\_$ .

Fill the blank by choosing a word with a meaning similar to that of the words given above.

A black square PQRS has been cut into two parts. One part of it is shown in Panel I. Which one of the shapes in Panel II is the other part?

A day can only be cloudy or sunny. The probability of a day being cloudy is 0.5 , independent of the condition on other days. What is the probability that in any given four days, there will be three cloudy days and one sunny day?