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There are 10 men. 5 of them are to be selected for a team. In how many ways this can be done if a particular person is to be selected in the team and if A is selected then B also is to be selected?

$\begin {array} {1 1} (A)\;21 & \quad (B)\;56 \\ (C)\;91 & \quad (D)\;126 \end {array}$

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