AP EAMCET · Maths · Permutation Combination
The number of all four digit numbers which do not have four distinct digits is
- A \(4464\)
- B \(4848\)
- C \(4355\)
- D \(4454\)
Answer & Solution
Correct Answer
(A) \(4464\)
Step-by-step Solution
Detailed explanation
\(\text{Total 4-digit numbers} = 9 \times 10 \times 10 \times 10 = 9000\) \(\text{4-digit numbers with 4 distinct digits} = 9 \times 9 \times 8 \times 7 = 4536\) \(\text{Numbers not having 4 distinct digits} = 9000 - 4536 = 4464\)
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