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Gkp question bank
If set contains∑={ a,b,c,d,e,f}then no of strings in ∑ of length 4 such that no symbol is used more than once in the string is ?
If set contains∑={ a,b,c,d,e,f}then no of strings in ∑ of length 4 such that no symbol is used more than once in the string is ?