Saturday, March 2, 2013
Numbers Q17
17.1399 x 1399 = ?
[A] 1687401
[C] 1943211
[B] 1901541
[D] 1957201
Answer
:
[D]
Explanation
:
(1399 x 1399) = (1399)
2
= (1400 - 1)
2
= (1400)
2
+ 1
2
- 2 x 1400 x 1
= 1960000 + 1 - 2800 = 1960001 - 2800 = 1957201
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