$f:[0,1]\to\Bbb R$ is a continuous function such that $f(1-x) = \dfrac1{f(x)}$ for all $x\in[0,1]$. The possible values of $\displaystyle\int_0^1 f(x)\mathrm dx$ are : a) $\pi$ b) $\dfrac7{22}$ c) $e$ d) $\dfrac 1e$
@RR. I think you are misunderstanding . You are thinking that the age starts counting from Jan but it can really start in any month for example, if you were born in Feb it doesnt help
