Question:`a + b = 5` এবং  `a - b = 3`  হলে, ` 4ab` এর মান কত? 

A `16` 
B `25` 
C `182/90` 
D `200/90` 

+ Answer
A 

+ Explanation
`4ab = (a + b)^2 - (a - b)^2`
       `= (5)^2 - (3)^2 = 16`

[ ন. প্র. য. বো ]

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Zinia Islam

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