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CUET
General Test
Quantitative Reasoning
Algebra
If a - b = 3 and
a2 + b2 = 689,
then the value of ab is:
320
330
340
500
Given,
a - b = 3
a2 + b2 = 689
( a - b )2 = a2 + b2 - 2ab
9 = 689 - 2ab
ab = 340