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

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answerhappygod
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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

Post by answerhappygod »

a) 35
b) 360
c) 49
d) 720
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