x + y = 12 এবং x-y=2 হলে xy এর মান কত?
Solution
Correct Answer: Option C
xy={(x+y)/2}²-{(x-y)/2}²
(12/2)²-(2/2)²
=6²-1²
=36-1
=35
(12/2)²-(2/2)²
=6²-1²
=36-1
=35
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