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1397 x 1397 = ?

/ Aptitude, Numbers / By
Question:
1397 x 1397 = ?

[A].

1951609

[B].

1981709

[C].

18362619

[D].

2031719

Answer: Option A

Explanation:

1397 x 1397 = (1397)2
= (1400 – 3)2
= (1400)2 + (3)2 – (2 x 1400 x 3)
= 1960000 + 9 – 8400
= 1960009 – 8400
= 1951609.