Excel uses ________ cell referencing by default in formulas and functions

The coupon collector problem characterizes the expected number of days that it takes to get n coupons if one receives one of these coupons at random every day in the mail. This number is approximately n ln n. Use this fact to compare the number of TCP connections that are initiated in a sequential port scan, going from port 1 to 65535, directed at some host, to the expected number that are

requested in a random port scan, which requests a random port each time (uniformly and independently) until it has probed all of the ports. What will be an ideal response?

Which of the following is not a type of navigation that Android provides?

a. Descendant navigation b. Entry navigation c. Outside navigation d. External navigation