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Question

Using (x+a)(x+b)=x2+(a+b)x+ab, find
103×104

A
10712
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B
10000
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C
11112
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D
10912
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Solution

The correct option is A 10712
103×104
=(100+3)(100+4)
Using,
(x+a)(x+b)=x2+(a+b)x+ab we get,
1002+(3+4)100+3×4
=10000+700+12
=10712

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