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In a flower bed, there are 23 rose plant...

In a flower bed, there are 23 rose plants in the first row, 21 in the second, 19 in the third, and so on. There are 5 rose plants in the last row. How many rows are there in the flower bed?

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The number of rose plants in the first, second third,..., and last row are respectively. `23,21,19,....,5.`
Let the number of rows of rose plants n.
The sequence `23,21,19,....,5` is an A.P. with first term a=23, common difference d=(−2), and nth term (=5).
`∴a_n=a+(n−1)d` ...
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