# Math Help - probability 2

1. ## probability 2

A very large shipment of parts contains 10% defectives. Two parts are chosen at random from the shipment and checked. Let X denote the numebr of defectives found. Find the probability function if this random variable.

Then the function is: $f(x) = { 2 \choose x } \left( {0.1} \right)^x \left( {0.9} \right)^{2 - x}$