Asked by richa
There are 21 rows of seats in an amphitheatre. Each row has 4 seats more than the row in front. The last row has 100 seats. How many seats are there altogether in the amphitheatre
Answers
Answered by
Steve
this is just an A.P. with
d = 4
a = 100-20*4 = 20
So, the sum of 21 rows is
S = 21/2 (20+100)
d = 4
a = 100-20*4 = 20
So, the sum of 21 rows is
S = 21/2 (20+100)
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