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CUET
General Test
Quantitative Reasoning
Algebra
If a - b = 2 and
a2 + b2 = 34,
then the value of ab is:
12
15
17
20
Given,
a - b = 2
a2 + b2 = 34
( a - b )2 = a2 + b2 - 2ab
4 = 34 - 2ab
ab = 15