Joy X. answered • 08/18/20
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Experienced Math tutor(SAT/ACT, high school and college math )
(7choose4)(6 choose4)=(35)(15)=525
Joy X.
tutor
Give you an easy example: You have three different cheeses A,B,C and two different crackers 1,2. You are making a platter of two types of cheeses and one type of crackers.
You choose two types of cheeses first, You have three choices(3 choose 2): AB,AC,BC
For AB, you can choose 1 or 2, so you have AB1 or AB2
For BC, you have BC1,BC2
For AC,you have AC1,AC2
total =(3 choose 2)(2 choose 1)=(3)(2)=6
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08/19/20
Pankhudi V.
Could you explain a little more08/18/20