9 rectangles

A large rectangle is divided into 9 small rectangles. How many rectangles are there in total (of all sizes)?

Final Answer:

n =  36

Step-by-step explanation:

C2(4)=(24)=2!(42)!4!=2143=6 a=3 b=3  a b=3 3=9  n1=(2b+1)=(23+1)=6 n2=(2b+1)=(23+1)=6  n=n1 n2=6 6=36



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