Question

in a flower bed, there are 23 rose plant in first row, 21 in second, 19 in third and so on. there are 5 rose plant in last row, how many rows are there in flower bed.​

Answer 1

Answer:

23,21,19,17,15,13,11,9,7,5

there are rows in that rise flower

Answer 2

Answer:

The number of rose plants in 1st, 2nd, 3rd,...., rows are : 23,21,19,....5

Let the number of rows in flower bed be 'n'.

a = 23

d = 21-23 = -2

$a_n=5$

$a_n= a+(n-1)d$

5=23+(n-1)(n-2)

-18=(n-1)(n-2)

n=10

So, there are 10 rows on flower bed.