Spectators 82430

In a circus, in one sector for spectators, the seats are arranged in such a way that in each higher row, there is one more seat than in the previous one. How many seats are there in a sector with 22 rows if there are 8 seats in the first row?

Correct answer:

s =  407

Step-by-step explanation:

a1=8 d=1 n=22  a22=a1+(221) d=8+(221) 1=29  s=2a22+a1 n=229+8 22=407

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