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Question

Using standard identity, solve:
1010×990 = .

A
999900
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B
100000
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C
990000
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D
119900
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Solution

The correct option is A 999900
1010 and 990 can be written as (1000+10)
and (100010) respectively.

1010×990=(1000+10)(100010
[We know, a2b2=(a+b)(ab)]
=10002102
=1000000100
=999900

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