r+1(n-r+1) ÷ r+2(n-r+2)
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Answer:r+1(n-r+1) ÷ r+2(n-r+2)
r+1(n-r+1) ÷ r+2(n-r+2)R+(n-r1)÷b+2
R+1÷n+2
Rn+1+2n
__________
n
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