Question

solve this question please help​

Answer 1

SEE THE AATACHMENT YOUR ANSWER IS THIS AND I THINK IT IS CORRECT

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Answer 2

Answer:

We know that the general form of H.P. is

1/a + 1/(a + d) + 1(a + 2d) + ...

The 7th term = 1/(a + 6d) = 1/20

=>  a +6d = 20

The 13th term = 1/(a + 12d) = 1/38 

=> a +12d = 38

Solving these two equations, a = 2 , d = 3

Hence 4th term = 1/(a+3d)

= 1/[2 + 3(3)]

= 1/11