Question

the nth term of a sequence is 8-5n .show that the sequence ia an AP

Answer 1

8 -5n
putting n=1

8-5×1
=8-5=3 again

putting n=2
8-5×2
8-10
-2
again
putting n=3
8-5×3
8-15=-7

hence the common difference is -5
this sequence is in a.p