Question

a theatre has 11 rows of seats which have 1 to 10 series. unmatched numbers have 15 seats and 16 seats have matched number. how many seats are there in theatre?​

Answer 1

a theatre has 11 rows of seats which have 1 to 10 series. unmatched numbers have 15 seats and 16 seats have matched number. how many seats are there in theatre?​

Step-by-step explanation:

sn = 15+(n-1)²

20th row n=20

∴The number of the seats in the theater will be:

15+(20-1)(2)=53 seats