Question

The first row of a conference hall has 8 chairs and 2 additional chairs in each subsequent row. How many chairs are in the 9th row? How many chairs in total are in the first 9 rows?

Answer 1

Ans:

24 chairs in 9th row and 144 chairs in ist 9th rows

Step-by-step explanation:

ist row= 8

2nd = 10

3rd =  12

.

.

.

9th row = 24

and if we add all chairs = 8+10+12+14+16+18+20+22+24= 144