Answer:
1. Jawahar Lal Nehru
2. Gulzarilal Nanda
3. Lal Bahadur Shastri
4. Indira Gandhi
5. Morarji Desai
6. Charan Singh
7. Indira Gandhi
8. Rajiv Gandhi
9. V. P. Singh
10. Chandra Shekhar
11. P. V. Narasimha Rao
12. Atal Bihari Vajpayee
13. H. D. Deve Gowda
14. Inder Kumar Gujral
15. Atal Bihari Vajpayee
16. Manmohan Singh
17. Narendra Modi
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