Question

which term of the ap 7,15,23... is 136 less than 47 term​

Answer 1

a=7, d=8

nth term=a+(n-1)d

∴47th term=7+(47-1)8

⇒47th term=7+(46×8)

⇒47th term=7+368

⇒47th term=375

Now, 136 less than 47th term=375-136=239

∴239=7+(n-1)8

⇒(n-1)8=239-7

⇒(n-1)8=232

⇒n-1=232/8

⇒n-1=29

⇒n=29+1

⇒n=30

∴It is 30th term