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In a flower bed, there are 23 rose plants in 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?

Posted by Nitin Mishra 5 years, 1 month ago

CBSE > Class 10 > Mathematics

1 answers

A K47 5 years, 1 month ago

AP is 23,21,19.....5 then d=21-23=-2 and a=23. To find no. Of rows use an=a+(n-1)d which is 5 = 23+(n-1)×-3 so n is 7. So number of rows is 7.

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CBSE > Class 10 > Mathematics