a + b = 5, a - b = 3 হলে, ab এর মান কত?

A 1

B 2

C 3

D 4

Solution

Correct Answer: Option D

ad - (a + b/2)2 -( a -b/2)2

 = (5/2)2 - (3/2)2 

 = 25/4 - 9/4
 
 = 4

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