Asource follower is required to connect a high-resistance source to a load whose

Asource follower is required to connect a high-resistance source to a load whose resistance is nominally 2 k but can be as low as 1.5 k and as high as 5 k. what is the maximum output resistance that the source follower must have if the output voltage is to remain within ±10% of nominal value? if the mosfet has kn = 2.5 ma/v2 , at what current id must it be biased? at what overdrive voltage is the mosfet operating?