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Question

Using suitable identities find the value of 999×1,001.

A
10,99,999
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B
9,99,999
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C
10,00,001
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D
None of the above
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Solution

The correct option is B 9,99,999
999×1,001
=(1,0001)×(1,000+1)
=(1,000)2(1)2
[since, (a2b2)=(ab)(a+b)]
=10,00,0001
=9,99,999

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