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by sheelanadh » Wed Aug 11, 2010 10:57 pm
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?


(a)23
(b)20
(c)7
(d)10


please help me........ how to solve it.....
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by clock60 » Wed Aug 11, 2010 11:29 pm
23=5+2(n-1)
n=10
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by likithae » Wed Aug 11, 2010 11:52 pm
clock60 wrote:23=5+2(n-1)
n=10

thank you ....but in the above steps used (n-1) ....can u explain me please..
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by clock60 » Thu Aug 12, 2010 12:07 am
it is AP
a(n)=a(1)+d(n-1)
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