JEE Advanced · MathematicsEasy
How many -digit numbers can be formed using the digits $1, 2, 3, 4,$ and if repetition is allowed?
- A.
- B.
- C.
- D.
Show correct answer & step-by-step solution
Correct answer: C —
Solution
- Each of the positions can be filled by any of the digits.
- The total number of ways is .
- The product is .
- Hence the answer is (C).
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