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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?

Posted by Vishal Shrivastav 6 years, 11 months ago

CBSE > Class 10 > Mathematics

2 answers

Divya Garg 6 years, 11 months ago

Sry..??10 rows

1Thank You

Divya Garg 6 years, 11 months ago

It forms an AP:23,21,19.......5 Here, a=23 l=5 d=-2 n=? L=a+(n-1)d 5=23+(n-1)(-2) 5-23=(n-1)(-2) -18=(n-1)(-2) -18/-2=n-1 9=n-1 9+1=n 10=n There are 1p rows in the flower bed...

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CBSE > Class 10 > Mathematics