Question

Question #7b3cb

Answer 1

`a_1=108`

Explanation:

Solving

`{ (a_2=a_4+40), (a_2+a_4=104), (a_4=lambda^2a_2) :}`

for `a_2,a_4,lambda` we have

`a_2 = 72, a_4 = 32, lambda = 2/3` but `a_1=a_2/lambda` then
`a_1=108`