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Q1
:
1397 x 1397 = ?
A
1981709
B
None of these
C
1951609
D
2031719
E
18362619
Solution
ANS:
A
- 1951609
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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