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

# In a flower bed, there are 23 rose plants in the first row, 21 in the second, 19 in the third, and so on. If there are   rose plants in the last row, then how many rows are there in the flower bed?

1. A
8
2. B
3
3. C
5
4. D
10

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### Solution:

Consider the given question,
In a flower bed, there are 23 rose plants in the first row, 21 in the second, 19 in the third, and so on.
Then, the A.P. is:
23,21,19,...,5
Thus,

Number of rows should be equal to the nth term.
So,

Therefore, there are 10 rows of rose plants.
Hence, option 4 is correct.

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