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JEE MATHEMATICS MCQ: COMBINATIONS

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Application +4 | -1

Determine

n

if

{ }^{2 n} {C}_3:{ }^n {C}_2=12: 1

View answer and explanation

Correct option: A

5

Option A (5) is correct because the ratio

{ }^{2 n} {C}_3:{ }^n {C}_2=12: 1

simplifies to

2n-1 = 9

, which gives

n=5

.

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n