a + b = c হলে a3 +b3 +3abc - এর মান কত ?
A a3
B b3
C c3
D - d3
Correct Answer: Option C
দেওয়া আছে , a+b = c
a3 +b3 +3abc = (a+b)3 - 3ab(a+b)+3abc = c3 -3abc+3abc (a+b = c বসিয়ে ) = c3
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