^n+1Cn-1=21

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Solution for ^n+1Cn-1=21 equation: 



^n+1n-1=21

We move all terms to the left:

^n+1n-1-(21)=0

We add all the numbers together, and all the variables

n+^n-22=0

We move all terms containing n to the left, all other terms to the right

n+^n=22

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