math
posted by sunil .
find the number of seat in a theater
containing 30 rows if the first row has 14 seats and each row after that has 2 more seats than the previous row

math 
drwls
14 + 16 + ... 70 + 72
Avg. number per row = (14+72)/2 = 43
Totsl = 43*30 = 1290.
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