Answer on Calculus Question for shasha
Help me please
The general formula is: a_n=a_1+(n-1)d.
As the second row has 2 more seats then the first we can write that d=2.
The thirteenth row has a_30=a_1+(30-1)d=10+29*2=68 seats.
So in the auditorium are a_1+a_2+...+a_30 seats, or
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