The answer to your question is he first one because you have to put it in a ratio of the smaller triangle then the bigger triangle hope this helps;)
If order mattered, then there would be 6*5*4*3 = 30*12 = 360 different ways to form the committee. However, no single member outranks the other. Each member has equal ranking. So order does not matter.
Since order does not matter, we must consider all of the ways to arrange a single group of 4 people. That is 4! = 4*3*2*1 = 24 ways. We overcount by a factor of 24 when order doesn't matter which is why we divide the previous result (360) by 24 to get 360/24 = 15
Answer: 15
Note: you can use the combination formula n C r = (n!)/(r!*(n-r)!) with n = 6 and r = 4 to get the same answer
Answer is 42 because 9×5 is 45 then you have to subtract 45-3 which equals 42
If you multiply, 120 and 1/3, you will get 40 as the height of his little brother.
First you have to flip the second fraction