For the first digit there are 7 choices. For the second digit there are 6 choices (because we can't use the same one again). And so on, until there is only one choice for the last digit.
The number of possible codes is this:
7*6*5*4*3*2*1 = 7! = 5040
<h3>What are trigonometric ratios?</h3>
Trigonometric ratios are defined as the ratio of different sides of a right angle triangle with respect to one angle of the right angled triangle.
Length of the wire = Hypotenuse of the triangle = X
Base of the triangle = Distance from the bottom of the tower to the point where wire is attached on ground = 20 m
Angle b/w Hypotenuse and Base of triangle = 46°
cos(θ) = Base / Hypotenuse
cos(46) = 20 / X
X = 20 / cos(46)
X = 28.79 m
Hence, the length of the wire is 28.79 m.
Learn more about trigonometry on:
brainly.com/question/24349828
#SPJ4
Answer:
C. 2 -2 -3
Step-by-step explanation:
this is a combination of indicated operations
the number on the left of the indicated operation is the original set
the number '1/4' next to R shows that you need to multiply certain numbers by 1/4
the subscript on the R's shows which row the multiplication needs to be done on...
in this case it is saying that 1/4 
+ 
will become the new
so multiply 1/4 by a number in the row and then add that to the corresponding number from
an example: (1/4 x 8) + 0 -------> 2
2 would be the new first number in the second row
