Question

The first three terms of an arithmetic progression are 12-x, 18 and 4x. Find

(a) the common difference of the progression.

(b) the sum of the 10th term to the 204th term. ​

Answer 1

Answer:

consider a b c s three terms.

then 2b=a/c

2(18)=(12-x)(4x)

end answer will be:

x1=0.804 and x2=11.196