Question

a algebra que plz of std 10th​

Answer 1

here is your answer !!!!

Answer 2

Answer:

Step-by-step explanation:

See it is a simple question of Arithmetic Progression In which terms are in this way-

1st term= 20

2nd term= 19

3rd term= 18

 First we need to find the no terms and then the last term as asked

Sum of Terms= 200

no of terms= n

(n/2)(2a+ (n-1)d)= 200

d=-1

n = 25, 16

But if 25 will be taken then last term will be negative therefore not possible. therefore number of rows are 16 and 1st row will have 5 seat only