Question

in a flower bed there are 43 rose plants in the first row 41 in second 39 in third and so on. there are 11 rose plants in last row how many rows are there in the flower bed.solve using ap

Answer 1

in ap form : 43,41,39,37,35......11 (d=-2)

an=a+(n-1)d

11 = 43 +(n-1)-2

11-43 = (n-1)-2

-32/-2 = n-1

16 + 1=n

n=17 therefore there r 17 rows in flower bed

                                       HOPE THIS HELPS !!

Answer 2

hope u understand it if u any doubt plz ask me