math
posted by vincent on .
which of the following sets is a subset
of A?
A:5,25,15,10,20,30
not just and answer
A.5,15,60
B.10,20,50
C.5,10,20
D.15,30,60
well i got the answer C

Right.
http://www.mathsisfun.com/sets/setsintroduction.html 
but i'm not so good at subsets can you explain, so i can maybe understand in a different way.

Please study the site I linked above.

ok