请教GWD1里几道数学题目不懂

xwqw

4.If n is the product of the integers from1 to 20 inclusive, what is the greatest integer k for which 2k is a factor of n?
10
12
15
18
20

Q25:
A photographer will arrange 6 people of 6 different heights for photograph by placing them in two rows of three so that each person in the first row is standing in front of someone in the second row.  The heights of the people within each row must increase from left to right, and each person in the second row must be taller than the person standing in front of him or her.  How many such arrangements of the 6 people are possible?

5
6
9
24
36

Q32:
For a convention, a hotel charges a daily room rate of $120 for 1 person and x dollars for each additional person.  What is the charge for each additional person?
(1)The daily cost per person for 4 people sharing the cost of a room equally is $45.
(2)The daily cost per person for 2 people sharing the cost of a room equally is $25 more than the corresponding cost for 4 people.

xwqw

哦 哦 这样哦 谢谢啦~~