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Mathematics, 07.01.2021 18:20 kkmoney

The staff of a bank consists of a manager, the deputy manager and other 10 officers. A committee of 4 is to be selected. Find the number of ways in which this can be done so that this can be done so as to always include (i) the manager, (ii) the manager but not the deputy manager, (iii)neither the manager nor the deputy manager.

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