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COS10003_Tutorial 07_SolutionsCounting1.A computer access password consists of from one to three letters chosen from the 26 letters inthe English alphabet with repetitions allowed. How many different passwords are possible?
Version: November 4, 2019. Yakub Sebastian3.A typical PIN (Personal Identification Number) is a sequence of any four symbols chosenfrom the 26 letters in the English alphabet and the 10 digits, with no repetition allowed. Howmany different PINs are possible?
2.Assume IPv4 Internet Protocol. Class B network IDs are used for medium to large localnetworks. The two left-most bits are set to 10, and the left-most 16 bits give the full networkID. The remaining 16 bits are used for individual host IDs, as long as they do not consist ofall 0’s or all 1’s.a.How many Class B networks can there be?
b.How many host IDs can there be for a Class B network?=

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