1.

81, 192, 375, 648, ?1). 10292). 13763). 14424). 1138

Answer»

The PATTERN of the above problem is:

First Term, 81 = (9)2 – (0)2

Second term, 192 = (14)2 – (2)2 = (9 + 5)2 – (0 + 2)2

Third Term, 375 = (20)2 – (5)2 = (14 + 6)2 – (2 + 3)2

Fourth Term, 648 = (27)2 – (9)2 = (20 + 7)2 – (5 + 4)2

∴ Fifth Term, ? = (27 + 8)2 – (9 + 5)2 = (35)2 – (14)2 = 1029


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