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^n Cr :^n C(r+1)=1:2and^n C(r+1):^n C(r+...

`^n C_r :^n C_(r+1)=1:2and^n C_(r+1):^n C_(r+2)=2:3,f i n dnandr`

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The correct Answer is:
`n=14, r=4`.
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