X+Y = 6 এবং XY = 6 হলে, (X-Y)2 এর মান কত?
A -12
B 12
C 8
D 10
Correct Answer: Option B
(x - y)2 = (x+y)2 - 4xy
= (6)2 - 4 × 6
= 36 - 24
= 12
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