Question
Download Solution PDFIf a = 4011 and b = 3989 then value of ab.
This question was previously asked in
Territorial Army Paper I : Official Practice Test Paper - 5
Answer (Detailed Solution Below)
Option 1 : 15999879
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Detailed Solution
Download Solution PDFFormula used :
(a + b) × (a - b) = a2 - b2
Calculations :
Let
a = 4000 + 11
b = 4000 - 11
⇒ a × b = (4000 + 11) × (4000 - 11)
⇒ 16000000 - 121
⇒ 15999879
∴ Option1 is the correct choice.
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