12. 81 x 81 +68 X 68 - 2 x 81 x 68 = RRB NTPC (Phase 1) 2016 (1) 156 (2) 169 (3) 196 (4) 201

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12. ( (2) 81^{2}+68^{2}-2 times 81 times 68 ) ( =(81-68)^{2}=13^{2}=169 )

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