How many strings of seven hexadecimal digits do not have any repeated digits? (b) How many strings of seven hexadecimal digits have at least one repeated digit? (c) What is the probability that a randomly chosen string of seven hexadecimal digits has at least one repeated digit? (Round your answer to the nearest tenth of a percent.) %

#1-20 state whether the angles are alternate interior, alternate exterior, vertical, or corresponding angles.

Abc will undergo two transformations to give aa'b'c' which pair of transformations will give a different image of aabc if the order of the transformations is reversed? a. a rotation 90' counterclockwise about the origin followed by a reflection across the y-axis b a translation 5 units down followed by a translation 4 units to the right c. a reflection across the x-axis followed by a reflection across the y-axis a rotation 180'clockwise about the ongin followed by a reflection across the y-axis reset next 2 omentum all rights reserved o atk me anything o o e

Asystem of equations has 1 solution.if 4x-y=5 is one of the equations , which could be the other equation ?