How many different subsets of the set {0, 1, 2} do not contain 0? Choose one.
A) A.6
B) B.7
C) C.1
D) D.4
E) E.2
Number of subset   Since we have 2 digits other than 0, we can take any numbers from the set of 2 to make a subset. Also it is a matter of selection and not arrangement.So we will consider combinations.   2c1+2c2=3   And one set is the NULL set having no elements in it so    3+1= 
<gadget id="calculator"> 3+1</gadget>
<output>4</output>
4.   ANSWER D.4.
<result>D</result>
How many different subsets of the set {0, 1, 2} do not contain 0?