Aptitude Questions
Feb 27, 2011
26. If a - b = 3 and a^2 + b^2 = 29, find the value of ab.
Ans :10
Explanation:
2
ab
= (
a
2
+
b
2
) - (
a
-
b
)
2
= 29 - 9 = 20
ab
= 10.
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ab = 10.ab = 10.ab = 10.
