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Question

Which of the following identity can be used to solve 5001 × 4999?

A
(a+b)×(ab)=a2 - b2
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B
(a+b)2 = a2 + 2ab + b2
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C
(ab)2 = a2 -2ab + b2
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D
(x+y)3 = x3 + 3x2y + 3xy2 + y3
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Solution

The correct option is A (a+b)×(ab)=a2 - b2
5001 = (5000 + 1)
4999 = (5000 - 1)
(5000 + 1)(5000 - 1) = 50002 - 12 [Identity (a + b) × (a - b) = a2 - b2 is used]
= 25000000 -1
= 24999999

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