Remember
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aw, latex is being uncoorporative right now
anyway
(a/b)^c=(a^c)/(b^c)
so
(4/5)^6=(4^6)/(5^6)=4096/15625
The best prediction is 300 because of you times 13 by 20 you get 260 which is close to 300
Answer: wut yea i think it's six too.
If both triangles are similar the ratio of sides will be same

The total number of articles is 14 and only 7 can be published. Since what is asked is the ways to assemble the 7 articles, this is a permutation problem.
14P7 = <span>17297280 ways
If order is not of concern, the problem is just a combination problem
14C7 = </span><span>3432 ways</span><span />