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CUET
General Test
Quantitative Reasoning
Algebra
If a - b = 4 and
a2 + b2 = 40,
then the value of ab is:
10
14
12
16
Given,
a - b = 4
a2 + b2 = 40
( a - b )2 = a2 + b2 - 2ab
16 = 40 - 2ab
ab = 12