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Question

102 X 99 =


A
11098
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B
10098
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C
10980
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Solution

The correct option is B 10098
We know the identity,
 (x+a)(x+b)=x2+(a+b)x+ab

Given:  102×99
(100+2)×(100+(1))
1002+(2+(1))100+2×(1)
1002+(1)100+2×(1)
1002+1002
10000+98
10098
​​​​​​​
Thus, 102×99=10098 

Mathematics

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