JEE MATHEMATICS MCQ: PERMUTATIONS

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If the number of ways of selecting

m

cards out of unlimited number of cards bearing the number
2, 3, 4 so that they can not be used to write the number 423 is 93. Then

m

is equal to

View answer and explanation

Correct option: B

Option B (5) is correct because the number of ways to select cards such that they cannot be used to write 423 is 93, which leads to the equation 3 * 2^m - 3 = 93, solving for m gives m=5.

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