Question 1204022
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<pre>

From 12 stocks, you can select 2 to the category "move up" by {{{C[12]^2}}} = 66 different ways.

From remaining 10 stocks, you can select 10 to the category "stay the same" by {{{C[12]^10}}} = 66 different ways.

The last 2 stocks are automatically in the category "move down" just without any choice (= 1 choice).


The answer to the problem's question is this produce 66*66*1 = 4356.
</pre>

Solved.


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To see many similar &nbsp;(and different) &nbsp;problems, &nbsp;solved and explained, &nbsp;look into the lesson

&nbsp;&nbsp;&nbsp;&nbsp;- <A HREF =https://www.algebra.com/algebra/homework/Permutations/Fundamental-counting-principle-problems.lesson>Fundamental counting principle problems</A> 

in this site.


Learn the subject from there.