In a flower bed there are 25 rose plants in the first row, 22 in the second , 19 in the third and so on. there are 4 rose plants in the last row. how many are there in the flower bed?

Answers (1)

These are in sequence of A.P=25,22,19,........,4
Then a=25
d=22-25=-3
L=4
L=a + (n – 1) d
4=25+(n-1)-3
4=25-3n+3
4=28-3n
3n+4=28
3n=28-4
3n=24
n=24/3
n=8
There fore there are 8 bedroses.

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