Correct answers only ! if you don't know the answer, then don't guess or say what you think it is.
given a student number system for a county requires that the student number be 6 characters.
the first 4 characters are any single digit number but no character can repeat and the last two characters must be a letter and letters cannot be the same. how many unique student numbers are possible?
a. 6,500,000
b. 3,276,000
c. 3,407,040
d. 6,760,000

B. 3,276,000

Step-by-step explanation:

Given : A student number system for a county requires that the student number be 6 characters.

Number of digits (0,1,2,3,4,5,6,7,8,9)=10

Number of letters in English alphabet = 26

When repetition of things is not allowed then we use Permutations.

Number of permutations of m things taking n at a time =

Similarly, Number of permutations of 10 numbers taking 4 at a time :

Number of permutations of 26 letters taking 2 at a time :

Now, the possible number of numbers can be make =

Hence, the correct answer is options (b).

the answer is (4,3)

since the rule for r0, 90º is (-y,x) and it was already applied to form the image, all you have to do is reverse the answer using this formula.