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CUET
General Test
Quantitative Reasoning
Algebra
If a - b = 5 and
a2 + b2 = 493,
then the value of ab is:
234
236
240
221
Given,
a - b = 5
a2 + b2 = 493
( a - b )2 = a2 + b2 - 2ab
25 = 493 - 2ab
ab = 234