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CAT 2021 Permutations and Combinations — Previous Year Question

Year

CAT 2021

Section

Quantitative

Topic

Permutations and Combinations

Difficulty

Medium

Question

Slot-3

A four-digit number is formed by using only the digits 1, 2 and 3 such that both 2 and 3 appear at least once. The number of all such four-digit numbers is

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