Question

In a flower bed there are 23 rose plants in first row 21 in the second 19 in the third and so on there are 5 rose plants in last row how many rose are there in flower bed

Answer 1

There are 140 flowers.Because 23+21+19+17+15+13+11+9+7+5=140 

Answer 2

ʜᴇʏᴀ ᴍᴀᴛᴇ!!

ʜᴇʀᴇ ɪs ᴜʀ ᴀɴsᴡᴇʀ ⏬ ⏬

ғɪʀsᴛ ʀᴏᴡ= 23

sᴇᴄᴏɴᴅ ʀᴏᴡ =21

ʟᴀsᴛ ʀᴏᴡ = 5

sᴏ ᴀs sᴇʀɪᴇs ɪs ɪɴ ᴛʜᴇ ғᴏʟʟᴏᴡɪɴɢ ᴡᴀʏ

23,21,.........................,5

ᴀ=23 ᴅ= -2 ᴀɴ= 5

ᴀɴ = ᴀ+(ɴ-1)ᴅ. ᴀɴ = 23+(ɴ - 1)-2

5-23 =(ɴ-1)-2

-18 =(ɴ-1)-2

-18/-2 =ɴ-1

9 =ɴ-1

9+1 =ɴ

ɴ =10