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Q.

Find the value of 113×87  .


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a

9831

b

1850

c

1587

d

3946 

answer is A.

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Detailed Solution

Given expression is 113×87  .
Using the identity a+b ab = a 2 b 2  .
Expand the expression and consider a=100 and b=13.
113×87= 100+13 10013 113×87= 100 2 13 2 113×87=10000169 113×87=9831  
Therefore, the value of 113×87  is 9831.
Hence, option 1 is correct.
 
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