Question

In a flower bed there are 23 rose plant in the First row 21 in the second 19 in the third and so on there are 5 rose plant in the last row then the number of row in the flower bed is​

Answer 1

23 , 21 ,19, the pattern has difference of 2 ...so if u calculate at the end there r 140 roses in the flower bed...and there r 10 rows

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.