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If ∑ = {a, b, c, d, e, f} then number of strings in ∑ of length 4 such that no symbol is used more than once in a string is
  • a)
    35
  • b)
    360
  • c)
    49
  • d)
    720
Correct answer is option 'B'. Can you explain this answer?
Verified Answer
If ∑ = {a, b, c, d, e, f} then number of strings in ∑ of lengt...
Explanation: Here string length is 4 so we create string of length 4 by 6 values firstly we arrange any value by 6 methods. Then Remaining numbers are 5 so we can arrange them by 5 methods then remaining numbers are 4 so we arrange them by 4 methods and then 3.Thus 6*5*4*3=360.
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