Find the value of n if (i)2nC3 : nC3 = 12 : 1 (ii) 2nC3 : nC3 = 11:1

Dear Student,
Please find below the solution to the asked query:
We have2nC3nC3=1212n2n-12n-23.2.1nn-1n-23.2.1=124n2n-1n-1nn-1n-2=1242n-1n-2=122n-1n-2=32n-1=3n-63n-2n=6-1n=5


We have2nC3nC3=1112n2n-12n-23.2.1nn-1n-23.2.1=114n2n-1n-1nn-1n-2=1142n-1n-2=1142n-11=11n-28n-4=11n-22n=6

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Perfect answers... Hunney jain.... accept request....

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i didn't understand the second last step plzz sm1 explain

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I think the answer is 5 and 6

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