Question

in a flower bed there are 23 rose plant in first row 21 in second,19 in the 3rd and so on there are 5 rose plant in the last row how many rows are there in the flower bed ​

Answer 1

Answer:

There are 23 rose plant in first row,21 rose plant in second row and 19 rose plant in third row.

Likewise it forms an A.P. 23,21,19,17..... with first term 23 and common difference -2.

Now, suppose last term is 5 and there are n rows.

So, Using concept of A.P.

Last term= a+(n-1)d

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

5= 23-2n+2

2n=20

n=10

Hence, there are 10 rows in flower bed.

Hope you have understood

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