Question

An amphitheatre has 15 seats in the first​ row, 19 in the​ second, 23 in the​ third, and so​ on, for 34 rows. How many seats are in the​ amphitheatre?

Answer 1

Total seats=15+19+23+27+31+35+39+43+47+51+55+59+63+67+71+75+79+83+87+91+95+99+103+107+111+115+119+123+127+131+135+139+143+147=2754 seats