a-b=4 এবং ab=20 হলে a3-b3 এর মান কত?
A 64
B 244
C 304
D 290
Correct Answer: Option C
a³ - b³= (a-b)³ - 3ab (a-b)= 4³ - 3 . 20 . 4= 64 + 240= 304
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