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GL SS SLGL SS SLGL SS SLGL SS SLGL SS SL GL SS SLGL SS SLGL SS SLGL SS SLGL SS SL Figure . We shall now illustrate the different rules described above through examples Example . A School library has books on Mathematics, books on Physics. A student can choose only one book.

In how many ways a student can choose a book on Mathematics or Physics? (i) A student can choose a Mathematics book in “ ” different ways. (ii) A student can choose a Physics book in “ ” different ways. Hence applying the Rule of Sum, the number of ways a student can choose a book is + = .

Now we shall discuss the problem stated in our introduction. Example . If an electricity consumer has the consumer number say : : , then describe the linking and count the number of house connections upto the 29th consumer connection linked to the larger capacity transformer number subject to the condition that each smaller capacity transformer can have a maximal consumer link of say . The following figure illustrates the electricity distribution network.

Monitoring & Control Transmission System Disribution System Substation Figure . There are smaller capacity transformers attached to a larger capacity transformer. As each smaller capacity transformer can be linked with only consumers, we have for the transformers, there will be × = 10900 links. For the th transformer there are only consumers linked.

Hence, the total number of consumers linked to the th larger capacity transformer is 10900 + = 10929 .