Melody

Aziz, that would depend on what restrictions were imposed and on what you mean by 'meet'.

If they were 50 people all in the same class then the probability would be close to 1.  

sam gave 2/5 of his money to his wife and spend 1/2 of the remainder. If he had #300 left, how much money did he have at first?

Let the total be T

$$\\\frac{3}{10}\;of\;T=300\\
\frac{1}{10}\;of\;T=100\\
All\;of\;total=1000\\$$

and 

$$\lim\limits_{b\to^-0}\frac{a}{b}=-\infty$$

Note for both this situations a is not equal to zero.

so if you approach 0 from above the answer tends to +infinty

and if you approach 0 from below the answer tends to -infinity

Which is a part of the logic explaining why anything divided by 0 is undefined.

Mmm I just noticed that I did not use any logs 

$$\\e^{ix}=cosx+isinx\\\\
e^{i\frac{\pi}{2}}=cos\frac{\pi}{2}+isin\frac{\pi}{2}\\\\
e^{i\frac{\pi}{2}}=0+i\times 1\\\\
e^{i\frac{\pi}{2}}=i\\\\
\mbox{raise each side to the power of i}\\\\
\left(e^{i\frac{\pi}{2}}\right)^i=i^i\\\\
e^{i^2\frac{\pi}{2}}=i^i\\\\
e^{(-1)\frac{\pi}{2}}=i^i\\\\
e^{\frac{-\pi}{2}}=i^i\\\\
therefore\\
i^i=e^{\frac{-\pi}{2}} \\\\therefore\\
i^i \mbox{ is a real number }$$

$$x^2=x \times x$$

But other than that it can equal anything.  It would depend on the rest of the question.

This could be the formula for the area of a square.

If the side length is x then area = x squared units squared

This would be a formula 

$$$Area = x^2$\\\\
If the side length is 6 cm then x=6 and\\
$Area = 6^2 = 36cm^2$\\\\
If the side length is 4inches then x=4 and\\
$Area = 4^2 = 16inches^2$\\\\
etc\\
Do you get the idea on how this might be useful?$$

We are all from different counties and taxes are different everywhere.  Plus, in any given country there are a lot of different taxes and they all have different rates.  So you need to be more specific.

They got free because they are identical and only one was definitely a robber and the witnesses could not identify which twin was guilty. 

Am I rich now?

Beats me - What have you found?    

Thank you Rosala.  Thumbs up is great and positive feedback is better still.

You make all my Christmas's come at once.