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JEE MATHEMATICS MCQ: PERMUTATIONS

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Nine hundred distinct N –digit numbers are to be formed by using 6, 8 and 9 only. The smallest
value of N for which this is possible is

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Correct option: B

7

The correct answer is D (

1+i \cot (\pi / 2 n)

) because it is the simplified form of the geometric series using complex number properties.

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