
I have done 1 and 2. I think C(a,a) is a circle. I want to do No 4. I have got a answer to no 3 for E. But I havent idea to do no 4. I have got a answer to C(a,2a)/ C(a,a) from E. After that what how to do it??

I have done 1 and 2. I think C(a,a) is a circle. I want to do No 4. I have got a answer to no 3 for E. But I havent idea to do no 4. I have got a answer to C(a,2a)/ C(a,a) from E. After that what how to do it??
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