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Question

Solve: 1001 × 990 using standard identity.


  1. 119900
  2. 999900

  3. 100000
  4. 990000


Solution

The correct option is B

999900


1010=(1000+10)
990=(100010)(Commutative law)
(1000+10)(100010)=10002102(Identity)
=1000000100
=999900

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