Either statement is sufficient.
1) nCr = nCn-r rule. We can get n from this.
2) nC11=12, multiplying both sides by 11!
nC11*11!=12!
nP1=12!
==> n=12
Detailed explanation if my answer is right.
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C & P
Source: Beat The GMAT — Problem Solving |
OA: IMO D.
Either statement is sufficient.
1) nCr = nCn-r rule. We can get n from this.
2) nC11=12, multiplying both sides by 11!
nC11*11!=12!
nP1=12!
==> n=12
Detailed explanation if my answer is right.
Either statement is sufficient.
1) nCr = nCn-r rule. We can get n from this.
2) nC11=12, multiplying both sides by 11!
nC11*11!=12!
nP1=12!
==> n=12
Detailed explanation if my answer is right.
Vineesh,
Just telling you what I know and think. I am not the expert.
Just telling you what I know and think. I am not the expert.
