Question

The 4th term of an ap is11 and the sum of 5th and7th term is 34 find difference

Answer 1

Answer:

Step-by step explanation:

a4=11

We know,

a+3d=a4

=>a+3d=11

=>d=11-a/3—(i)

A/Q

=>a5+a7=34

=>a+4d+a+6d=34

2a+10d=34

10d=34-2a

d=34-2a/10

11-a/3=34-2a/10—(from(i)

11-a(10)=3(34-2a)

110-10a=102-6a

110-102=10a-6a

108=4a

108/4=a

27=a

•°•d=11-a/3

=11-27/3

=6/3

=2

So common difference is 2...

Hope it helps u