Coding help
Not what you're looking for?
You are setting up a program for programming codes for a universal TV remote controller. Each code will have five digits and cannot include a 0 or repeat any digits. How many codes:
a) do not contain a 7?
b) have 3 as the third digits and 5 as the fifth digit?
c) begin with an even number?
d) begin and end with an even number?
Purchase this Solution
Solution Summary
Coding help is embedded.
Solution Preview
a)
we have 5 free places like this: _ _ _ _ _
Now we need to fill them and count them. In the first free place, we can put numbers between 1 to 9 except for 7 which makes it 8 numbers. So up to now we have this: 8 _ _ _ _
In the next house we can put numbers between 1 to 9 except for 7 and except for the number that we put in the first house so we have 7 choices here thus up to now: 8 7 _ _ _
If we continue like this we get 8 7 6 5 4 as the number of digits (or choice of digits) that can be put in 1st to last house. Now our ...
Purchase this Solution
Free BrainMass Quizzes
Probability Quiz
Some questions on probability
Know Your Linear Equations
Each question is a choice-summary multiple choice question that will present you with a linear equation and then make 4 statements about that equation. You must determine which of the 4 statements are true (if any) in regards to the equation.
Exponential Expressions
In this quiz, you will have a chance to practice basic terminology of exponential expressions and how to evaluate them.
Geometry - Real Life Application Problems
Understanding of how geometry applies to in real-world contexts
Solving quadratic inequalities
This quiz test you on how well you are familiar with solving quadratic inequalities.