Full employment is not considered to be zero unemployment, because people do not find jobs instantaneously. there are not enough jobs for everyone who wants one. some cyclical unemployment always exists. some people do not want a job.

because people do not find jobs instantaneously.

Explanation:

Full employment refers to an economic situation whereby the available labor resources in the economy are used in the most efficient way. It is when the highest amount of both the skilled and the unskilled labor in an economy are employed at a particular time.

It should be noted that full employment is not considered to be zero unemployment because there'll always be the minimum rate rate of unemployment which is the natural unemployment rate in such economy as people do not find jobs instantaneously.

there's 11 people for the 1st position. then, no matter who gets it, there's only 10 left for the second, and then 9 left for the third. 11 x 10 x 9 = 990.   the answer is there are 990 different ways the positions can be filled by these applicants