the front row of a stadium has 25 seats. each of the other rows has two more seats than the row in front of it. how many seats are there altogether in the first 20 rows?
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@timo86m :can u explain how did u get that ?
im studying for the SATs and am struggling greatly with permutations
@Megichu : U know A.Sequence basics ?
i understand what the basic formula is, but interpreting the problem at times can be difficult
Front row=a=first term=25.
Each of the other rows has two more seats than the row in front of it ,thats mean that the difference between every two rows is 2 ,So d=2
Sum law : Sn=n/2[2a+(n-1)d]
where n = number of terms ..
now lets fill up the rule
S20=20/2 [2*25+(20-1)2]=880 seats .
Make sense ?
perfect. thank you so much for the great response! and yes, that makes much more sense
Great,Inform me when you need help :)
not sure why i have such a difficult time with these problems (considering that their are 2 main formulas XD) but i really appreciate the help
also, this site is great. i look forward to using it more often!
Just keep solving examples ,Then it will get much easier :)
definitely doing a lot of that right now! haha im taking an SAT course right now and have a packet to practice all of these lovely problems :3