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The President may first appoint him the Prime Minister and then ask him to prove his majority in the Lok Sabha within a reasonable period. For example, Charan Singh (1979), VP Singh (1989), Chandrasekhar (1990), PV Narasimha Rao (1991), AB Vajyapee (1996), Deve Gowda (1996), IK Gujral (1997) and again AB Vajpayee (1998) were appointed as Prime Ministers in this way.
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M. Laxmikanth (Indian Polity)