How many 5-letter words can be formed using A, B, C, D, E, F, G, H, I, J, a) if the letters in each word must be distinct? b) if, in addition, A, B, C, D, E, F can only occur as the first, third or fifth letters while the rest as the second or fourth letters?

Q: a) Suppose in a university, each subject offered to students has a subject code consisting of four…

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Q: four or five-digit PIN is to be selected from the ten digits 0,1,2,3,4,5,6,7,8,9. How many 4-digit…

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Q: Q)1 a) How many 3 digits passcodes are there if first digit must be a 1 or 2 ?   b) How many 3…

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