The Natural Woman, a women's health food store, offers its own blends of trail mix. If the store uses 4 different ingredients, how many bins will it need to hold every possible blend, assuming that each blend must have at least two ingredients? (Also assume that each bin can hold one and only one blend.)  Choose the correct choice from the following choices: A) 1 B) 4 C) 7 D) 11 E) 10
We're told that there are 4 ingredients (we'll call them A, B, C and D); we're told that each 'mix' must include AT LEAST 2 ingredients...   2 ingredient blends:   AB   AC   A11   BC   B11   C11   3 ingredient blends:   ABC   AB11   AC11   BC11   4 ingredient blends:   ABC11   Total blends = 6+4+1= 
<gadget id="calculator">6+4+1</gadget>
<output>11</output>
11   Final Answer:11
<result>D</result>
The Natural Woman, a women's health food store, offers its own blends of trail mix. If the store uses 4 different ingredients, how many bins will it need to hold every possible blend, assuming that each blend must have at least two ingredients? (Also assume that each bin can hold one and only one blend.)