Home › CBSE Class 11 (Commerce) › Mathematics › Permutations and Combinations › How many 4-digit numbers have no repeated digit?
How many 4-digit numbers have no repeated digit?
A5040
B4536
C9000
D3024
Answer & Solution
Correct answer: B. 4536
The first digit cannot be 0, so 9 x 9 x 8 x 7 = 4536.
Related questions
Al-Khalil's cryptography book listed words using which idea?A permutation of a finite set is what kind of function on that set?A k-combination of a set S is best described as what?Cauchy's 1815 memoir on substitutions of n elements led to which notion?Which Chinese text used permutation-like hexagrams as early as 1000 BC?How many elements does the symmetric group on 4 objects contain?In how many ways can the letters of BANANA be arranged?A multiset permutation uses each element how many times?