Question 1138236

an amphitheater has 23 seats in the front row, 25 in the second, 27 in the third, and so on, for 24 rows

how many seats are in the amphitheater?
<pre>Sum of an A.P.: {{{matrix(1,3, S[n], "=", (n/2)(2a1 + (n - 1)d))}}}
Sum of THIS A.P.:  {{{highlight_green(matrix(1,11, S[24], "=", (24/2)(2(23) + (24 - 1))2, "=====>", S[24], "=", 12(46 + 46), "=", 12(92), "=", "1,104"))}}}
ACCEPT no other answer.