Cinema

How many rows of seats are in the stands, if you know that the first row has 24 seats and the last 50 seats and each subsequent row has two seats more than row before? How many seats are in the stands?

Correct result:

n =  14
s =  518

Solution:

n=(5024)/2+1=14
s=24+26+28+30+32+34+36+38+40+42+44+46+48+50=518



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