Junior high school first grade mathematics, the best way to do the problem The following numbers are given in turn: 2, - 4, 8, - 16, 32 Question (1) try to write the following three numbers according to the arrangement of the given numbers (2) What is the number 2010 in this group? What is the number n?

Junior high school first grade mathematics, the best way to do the problem The following numbers are given in turn: 2, - 4, 8, - 16, 32 Question (1) try to write the following three numbers according to the arrangement of the given numbers (2) What is the number 2010 in this group? What is the number n?

(1) , continue to write three numbers: - 64128, - 256
(2) , - (- 2 to the power of 2010), that is - 2 to the power of 2010, is a negative number; the nth number is - (- 2 to the power of n)
Because the even power of - 2 is positive, plus a negative sign is negative; the odd power of - 2 is negative, plus a negative sign is positive

（ ）（ ）（ ）
（ ）（ ）（ ）
（ ）（ ）（ ）
Fill in the brackets with 21, 22, 23, 24, 25, 26, 27, 28 or 29, so that the sum of horizontal, vertical and oblique is 75

24 29 22
23 25 27
28 21 26

There are 50 students in the class taking part in the test, 41 of them answered the first question correctly, 30 of them answered the second question correctly, 45 of them answered the third question correctly, 38 of them answered the fourth question correctly, and three of them didn't answer correctly. At least how many of them answered the four questions correctly?

30-(50-3-41)-(50-3-45)-(50-3-38)
=30-6-2-9
=13