Area is the area<span> of a flat, or plane figure is the number of unit squares that can be contained within it. The unit square is usually some standard unit, like a square meter, a square foot, or a square inch</span>
        
                    
             
        
        
        
Given a group of 
n object. We want to make a selection of 
k objects out of the n object. This can be done in 
C(n, k) many ways, where 

,
where k!=1*2*3*...(k-1)*k
Thus, we can do the selection of 3 cd's out of 5, in C(5,3) many ways, 
where 

Answer: 10
 
        
        
        
Definitely not. They are both perfect squares. A prime number is one where its only factors are one and itself.
        
                    
             
        
        
        
Well if you have 60 and she has 120 i will set it out as a sequence week by week
60,67,74,81,88,95,102,109,116,123,130,137,144,151,158,165,172,179,186,193,200,207,214,221,228,235,242,249,256,263,270
120,125,130,135,140,145,150,155,160,165,170,175,180,185,190,195,200,205,210,215,220,225,230,235,240, 245,250,255,260,265,270 
it would take 31 weeks and the total is 270