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1397 x 1397 =?
1951609
1981709
18362619
2031719
None of these
Correct Answer:
1951609
Explanation:
1397 x 1397
= (1397)
2
= (1400 - 3)
2
= (1400)
2
+ (3)
2
- (2 x 1400 x 3)
= 1960000 + 9 - 8400
= 1960009 - 8400
= 1951609.
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