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?
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.
