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Your contribution to NPS can be claimed under Section 80CCD1(b)as well as Section 80C. So If you have can use other investments to claim 1.5 lakh deduction under 80C then you can claim your NPS contribution first under 80CCD1(b) for 50,000 then remaining along with other investments under 80C for Rs 1.5 lakh.
So the total deduction you can claim is Rs 2 lakh.