Question

. In a flower bed, there are 23 rose plants in the first row, 21 in the second row, 19 in the

third row and so on. There are 5 rose plants in the last row. How many rows are there in

the flower bed?​

Answer 1

Answer:

AP = 23,21,19....,5

a = 23

an=5

d = 32-21= 2

n = no of rows

now an = a+ (n-1)d

5 = 23 + (n-1) 2

-18/2 = n-1

8 =n