Question

In a flower bed, there are 23 rose plants in the first row, 21 in 2nd, 19 in 3rd row,and so on. There are 5 rose plants in the last row. How many rows are there in the flower bed

Answer 1

Step-by-step explanation:

$\huge{ \purple{b}r\red{a} \green{i} \pink{n} \orange{l} \purple{i} \green{s}t}</p><p> \\ \\ </p><p> \huge{ \purple{p}\red{l} \green{e} \pink{a} \orange{s} \purple{e} }$

First row= 23

Second row =21

Last row = 5

So as series is in the following way

23,21,.........................,5

a=23 D= -2 an= 5

an = a+(n-1)d. an = 23+(n - 1)-2

5-23 =(n-1)-2

-18 =(n-1)-2

-18/-2 =n-1

9 =n-1

9+1 =n

N =10