Question

the last term of ap is 254. the first term is 4. the tenth term from the end is 209. find the common diiference

Answer 1

the last term of ap is = 463

Answer 2

reverse the A.P

taking first term is254

and last is 4

now 10th term is not from the end side

a10= a+9d

209 = 254+9d

209-254= 9d

-45 =9d

d = -45/ 9

d = -5