# JEE-Advanced 2015 (19.D/40)

**Algebra**Level 4

Let the harmonic mean of two positive real numbers \(a\) and \(b\) be 4. If \(q\) is a positive real number such that \(a, \ 5, \ q, \ b\) is an arithmetic progression, then find the value(s) of \(|q-a|\). \[\begin{array}{} (1) \, 1 \quad \quad \quad \quad \quad \quad \quad \quad & (2) \, 2 \\ (3) \, 3 & (4) \, 5 \end{array}\] **Note:**

Submit your answer as the increasing order of the serial numbers of all the correct options.

For eg, if your answer is \((1),(2)\), then submit 12 as the correct answer, if your answer is \((2),(3),(4)\), then submit 234 as the correct answer.