A computer password is made up of four characters. Each character can be a capital letter (A through Z), a lowercase letter (a through z) or a digit (0 through 9).How many passwords have 2 letters (uppercase or lowercase) and 2 digits?
A. 52 × 51 × 10 × 9
B. 6 × 522 × 102
C. 2 × 522 × 102
D. 522 × 102
E. none of these
Answer: B
Mathematics
You might also like to view...
Graph the ellipse described.Center at (0, 0)Focus at (4
, 0)Vertex at (8, 0)
A. 
B. 
C. 
D. 
Mathematics
The figure shows an angle ? in standard position with its terminal side intersecting the unit circle. Evaluate the indicated circular function value of ?.Find sin ?.
A. - 
B. 
C. - 
D. 
Mathematics
Simplify.
A. 
B. 
C. 
D. 1
Mathematics
Answer the question.Consider the numbers 5, 
, -2, 0, 
, 
, 
, 0.05. Which are rational numbers but not integers?
A. 
, 0.05
B. 0, 
, 0.05
C. 0.05
D. 
, 0.05
Mathematics