In each of the folloving groups of nouns pick ouit the one that is different in class from the others:

1) brethren;

2) data;

3) basis;

4) pence.

 In each of the following groups of nouns pick out the one that is different in class from the others:

1) series;

2) means;

3) deer;

4) teeth.

Заранее спасибо*** 

В первом 4 а во втором 2,вроде бы так.