# need help

Discussion in 'Homework Help' started by nour1, Oct 14, 2010.

1. ### nour1 Thread Starter New Member

Oct 14, 2010
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hi how are u all?please i need help i have hard question that i canُ t solve it please explain it to me and solve it or gave me an example which have the same way to solve it please thwe question is:

How many bits are in 1TB? ((Hint: depending on the tool used to calculate this you may need to use a trick to get the exact result. Note that 2^20=1000000(base 10)+d, where d is the difference between 2^20 and 1000000(base10)and that 1T=(1000000(base 10)+d)^2. Expand the equation for 1T into a sum of products form insert the value of d find the three products and then find their sum.
thank you so much.

2. ### Georacer Moderator

Nov 25, 2009
5,151
1,266
In general 1T means 10^12, which is a 1 followed by 12 0.

Specificly in informatics, where numbers are expressed in powers of 2 the prefixes are:
1K=2^10=1.024
1M=2^20=1.048.576
1G=2^30=1.073.741.824
1T=2^40=1.099.511.627.776

3. ### nour1 Thread Starter New Member

Oct 14, 2010
10
0
so the answer of the question is??

4. ### Georacer Moderator

Nov 25, 2009
5,151
1,266
So the answer is 1T*(Number of bits in a byte).

5. ### nour1 Thread Starter New Member

Oct 14, 2010
10
0
thank for your help. but antil now i donُ t know how to solve it really and tomorrow i should submit

6. ### Georacer Moderator

Nov 25, 2009
5,151
1,266
What is it that you can't solve? The multiplication (2^40)*8?

7. ### nour1 Thread Starter New Member

Oct 14, 2010
10
0
the holl question

8. ### Georacer Moderator

Nov 25, 2009
5,151
1,266
The question is "how many bits are there in 1TB", right?

I can't believe I 'm saying this, but to find the aswer hit the following buttons on a scientific calculator (windows has one): 2 ^ 40 * 8

If I were you I wouldn't bother with the hint equation the question proposes.

Oct 14, 2010
10
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thanks alot

10. ### nour1 Thread Starter New Member

Oct 14, 2010
10
0
A limited number system uses base 12. Suppose there are at most four integer digits. The weights of the digits are 123, 122, 121, and 1. Special names are given to the weights as follows: 12 = 1 dozen, 122 = 1 gross, and 123 = 1 great gross.
(a) How many beverage cans are in 6 great gross + 8 gross + 7 dozen + 4?
(b) Find the representation in base 12 for 756910 beverage cans.
Note: available digits are: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, A, B.
Ans:
(a) 6 Ũ 123 + 8 Ũ 122 + 7 Ũ 12 + 4 = 11608
(b) 7569 ũ 12 = 630 ...... 9
630 ũ 12 = 52 ...... 6
52 ũ 12 = 4 ...... 4
4 ũ 12 = 0 ...... 4
756910 = 446912
and what we mean by ũ and Ũ what is the diferent between them
thank u

11. ### Georacer Moderator

Nov 25, 2009
5,151
1,266
Please correct the colour of the unit names, which appear in white. You also havent given the weight of the beveragecan.

In all, this seems to be badly coppied. It hardly makes any sense. If you have copied this from a webpage, you propably don't have the right font to display special characters.

12. ### nour1 Thread Starter New Member

Oct 14, 2010
10
0
A limited number system uses base 12. Suppose there are at most four integer digits.the weights of the digits are are 12^3,12^2,12 and 1 .special names are given to the weights as follows:12=1dozen,12^2=1gross and 12^3=1 great gross.

a)how many beverage cans are in 6 great gross+8 gross+7 dozen+4?
b) find the representation in base12 for 756910 beverage cans.

Note:available digits are:0,1,2,3,4,5,6,7,8,9,A,B.

Ans:
a)6 Ũ123+8 Ũ122+7 Ũ12+4=11608
b)7569 ũ12=630…..9
630 ũ12=52……6
52 ũ12=4……….4
4 ũ 12=0…………4
756910 = 446912​

13. ### nour1 Thread Starter New Member

Oct 14, 2010
10
0
what we mean by ũ and Ũ what is the diferent between them
thank u
did we mean by
is ũ =×
and Ũ= ÷
or something else??
thank u

Last edited: Oct 15, 2010

Oct 14, 2010
10
0