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Q1
:
(489 + 375)
2
- (489 - 375)
2
= ?
(489 x 375)
A
864
B
2
C
4
D
None of these
E
144
Solution
ANS:
D
- 4
Given Exp. =
(
a
+
b
)
2
- (
a
-
b
)
2
=
4
ab
= 4
ab
ab
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