Ask Ghassem - Recent questions tagged discrete-math

Intermittent Mathematics (Logarim)

Wed, 05 May 2021 12:16:20 +0000

The old keypad of the telephone, it has 10 numbers (10 keys) , this keypad allows the user to enter a text by successively pressing certain key many times in a small period of time. you need to draw a graph of entering a text input using this keypad. after that you need to have a certain algorithm of finding the length of a path to enter certain text
example
aaa --> 6
aba --> 5

the link below shows the phone keypad

https://commons.wikimedia.org/wiki/File:Telephone-keypad.png

Probability of a bus arrived in its destination based on weather condition

Mon, 09 Nov 2020 13:06:47 +0000

A bus is making its way to a destination. If the weather conditions are favorable today, the likelihood of delay is 3%. If the weather conditions are not favorable today, the likelihood of delay is 50%. The forecast predicts that it is 20% likely that the weather conditions will be favorable today.

1. What is the likelihood that the bus will be delayed?

2. The bus has arrived, but it was delayed. Given that the bus was delayed, what is the likelihood that the weather conditions were favorable?

can someone send me an online link to discrete mathematics 8th edition textbook?

Thu, 13 Feb 2020 00:22:28 +0000

Understanding symbolic language of problem, quantificational logic

Sun, 26 Jan 2020 11:18:05 +0000

Hi, i am having trouble interpreting the information contained in the relation R, and how it should be applied to the Ps in this problem:

Consider the formula

∃x∃y∃z(P(x,y)∧P(z,y)∧P(x,z)∧¬P(z,x))

Under each pf these interpretations, is this formula true? In each case, R is the relation corresponding to P.

(a) U = N, R = {<x,y> : x<y}.

(b) U = N, R = {<x,x+1> : x≥0}.

Does <x,y> refer to the variables x,y or z in each P(a,b), and the :x<y refer to what the relation between these two should be?

I tried something like this for (a) and got:

∃x∃y∃z((x<y)∧(z<y)∧(x<z)∧¬(z<x))

However I'm not sure if this is correct, and I'm not sure how I would do it for (b)

What are the values stored in tc8 format for the following numbers?

Thu, 23 Jan 2020 19:27:01 +0000

Q1) Calculate tc8 of -117, -127, 127, 0

Q2) What values are stored in the following tc8 registers:

10010001
00010001
01111111
0000000
11111111

How to calculate $g[h(3)]$ if $g(x)= 2x+3$ and $h(x) =4x+5$ ?

Fri, 06 Dec 2019 00:47:26 +0000

Need help solving this question

How do i find the inverse of the function?

Thu, 05 Dec 2019 23:10:55 +0000

If $h(x) =4x+5$, how do i find h inverse of x?

Could you please share cheat sheet of Logic Operations?

Mon, 08 Oct 2018 17:49:42 +0000

What's the differences between [NOT p OR NOT q] and [NOT (p OR q) ]

Mon, 08 Oct 2018 16:24:05 +0000

I think these two statements are similar, can anyone tell me the differences?

What does verifying message integrity have to do with boolean simplification and truth tables?

Thu, 04 Oct 2018 14:54:04 +0000

In an assignment, I have the question :

“Based on this assignment, I can be more confident in myself.”

Show that the message is not/is corrupted based on the following two scenarios:

The same message is received at the destination, and (10 marks)
the word “more” in the above message is replaced with the word “less”. (10 marks)

What is this question asking? Perhaps it wants me to convert the message into a boolean expression? Even then, how can I show that its "corrupted" or not.

What is the priority order of Either Or (EOR) when constructing truth tables

Wed, 03 Oct 2018 18:26:01 +0000

In terms of the precedence order of operative, it followings like this

Operative	Order
NOT	1
AND	2
OR	3
--->	4
<-->	5

But I was wondering waht would be the order of precedence for the operative of EOR

Is this answer to a question counted as a legitimate answer

Wed, 03 Oct 2018 18:13:44 +0000

I was doing an assignment and this is one of the questions

Q4) (a) Find a compound proposition using only p, q, ¬, and the connective OR with the truth table at the right (4 marks)

p	q	?
T	T	F
T	F	F
F	T	T
F	F	F

(b) Find another compound proposition that is based on the previous truth table (4 marks)

So my answer to part (a) is: NOT (p OR NOT q)

And my answer to part (b) is: NOT (NOT (NOT (p OR NOT Q)

I was wondering is my answer to part (b) is counted as a legit answer to the question, because it's right but it's not really expanding the information given and just using the previous answer.

Is there any easy way to draw the Truth Table for logic expressions?

Fri, 28 Sep 2018 17:37:33 +0000

I can solve the Truth Table, but do not know how to verify my answers. Could you please suggest a tool for it?

Where can I find the solution manual for Discrete Mathematics and Its Applications by Rosen?

Fri, 28 Sep 2018 17:10:54 +0000

I am taking a math course and I am looking for solution manual of Discrete Mathematics and Its Applications by Rosen?

Could you please share a good cheat sheet for logic gates?

Fri, 28 Sep 2018 15:58:38 +0000

How can I convert between binary/hexadecimal numbers with decimals into a decimal number system

Sun, 16 Sep 2018 17:40:53 +0000

I was wondering on how to convert between number systems when the factor of decimal in binary and hexadecimal numbers is in play. For example,

Convert 011010.011b into a decimal number system

or

Convert 1C0DE.4Ah into a decimal number system

Where can I find some good Numbering System Exercises and learning it better?

Sun, 16 Sep 2018 00:43:41 +0000

I have a math course at College and I am wondering if someone can show me resources I can use to improve my math skills in discrete math, especially for Number Systems?