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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

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Correct option is B

Required number of ways =9C4=126

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Let A be the set of 4-digit numbers a1a2a3a4 where a1<a2<a3<a4 then n (A) is equal to

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Ready to Test Your Skills?

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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