x + y = ১২ এবং x – y = 2 হলে xy এর মান কত?
Solution
Correct Answer: Option B
দেওয়া আছে, x+y = 12 এবং x-y = 2
∴xy= {(x+y)/2)}2 - {(x-y)/2}2
=(12/2)2-(2/2)2
=62-12
=36-1 = 35
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