CAT 2018 Permutations and Combinations Question (Medium)

Question

How many numbers with two or more digits can be formed with the digits 1, 2, 3, 4, 5, 6, 7, 8, and 9 so that in every such number, each digit is used at most once and the digits appear in the ascending order? TITA

Accepted Answer

Step 1 Understand the condition We are given digits 1 to 9 We need to form numbers with at least 2 digits - Each digit used at most once - Digits must appear in strict ascending order That means for any chosen set of digits, there is only one valid number that can be formed since their order is fixe

CAT 2018

Quantitative

Permutations and Combinations

Medium

How many numbers with two or more digits can be formed with the digits 1, 2, 3, 4, 5, 6, 7, 8, and 9 so that in every such number, each digit is used at most once and the digits appear in the ascending order? [TITA]

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