Let A be the set of 4-digit numbers a 1 a 2 a 3 a 4 where a…

Maths Permutations & Combination Definition of Combinations, Condition Combinations, Division into Groups, Derangements Single Correct MCQ

Published by: CGP EDU Academic Team

Published on: August 14, 2026

Let A be the set of 4-digit numbers a 1 a 2 a 3 a 4 where a 1 > a 2 > a 3 > a 4 , then n(a) is equal to

126

210

None of these

Text Solution

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The correct answer is:

Any selection of four digits from the ten digits 0, 1, 2, 3,..., 9 gives one such number.

So, the required number of numbers = 10 C 4 = 210

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