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Question

1904 x 1904 = ?


Options:
A .  3654316
B .  3632646
C .  3625216
D .  3623436
E .  nono of these
Answer: Option C

1904 x1904 =` (1904^2)` = `(1900 + 4)^2`

                     =`(1900)^2` + `4^2` +2 x 1900 x 4 = 3610000 + 16 + 15200

                     =3610016 + 15200 = 3625216        




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